Contents

The Best Aquarium Auto Top Off of 2023 – Reviewed and Top Rated

2,332 Reviews Scanned

Rank No. #1

Useek Auto Top Off 233

SaleRank No. #2

MostAqua Auto Top Off for Freshwater Saltwater Aquarium, Fish Tank ATO Aquarium Top Off System

Compact design, upgraded safer optical sensor, no matter how long you are away, ATO system can ensure that your tank is refilled in time.
The unit comes with a micro whisper pump, small but powerful, with a maximum head of 3 meters and a maximum flow rate of 70 GPH.
Anti-overfill function can avoid flooding your fish tank, more reliable.
The patented design of the tube holder can not only fix the re-filling tube but also can be used to hold the air tube.
MostAqua offer 90 Days warranty. If you are not happy with our Aquarium ATO or receive a defective unit, we will propose you satisfactory resolution. Please feel free to contact with us if any questions or concerns.

SaleRank No. #3

Fzone Aquarium ATO Auto Top Off Refilling System with Dual Optical Sensor for Both Reef and Fresh Tank （360P)

Small in size; install in a compact space, install in both rimed & rimless aquariums or sumps. ATO is nano at only 0.7 inches.
Includes <1mm dual precision optical sensors, watches the water level in real time, ensures the aquariums water fluctuation is less than 0.6 centimeters.
New technologies that allow the ATO to be more reliable; EFTT(Extened-Filling-Time Technology), AFT(Anti-fluctuation Technology) techology, & upgraded QST 2.0 (Quick-Security Technology). EFTT can recognize your aquariums size & will dertimine how long it takes to fill to the desired level. QST alerts you in real-time when the ato is finished & prevents over filling. AFT measures the water level & ensures the ATO doesn't activate the pump unnecessarily.
QST 2.0 provides real-time protection against overfilling & won't allow the pump to run dry. The ATO controller will give a visual alert & stop the pump immediately when it senses a refilling time more than 6 times longer than the time calcualted by EFTT. QST will detect malfunctions of the sensor, controller or if you have a empty reservoir. Version 2.0 includes new technology making our ATO’s the most safe option.
All accessories included in the package. Strong magnets can support aquarium wall thickness up to 0.78 inches (20mm). Check valve prevents backflow & will not drain your main display. 74 gallon per hour water pump will lift water up to 2 meters ensuring water delivery to even the biggest aquariums.

Rank No. #4

Red Sea 3-in-1 ReefATO + ATO Auto Top Off System for Aquarium | Water On Floor Alarm | App Controled with Fish Tank Temperature Probe

Fail-proof (solid-state EC technology) water level sensor, with built-in back-up pump-OFF probes located 2.5cm / 1” above the normal pump-OFF point.
The full array of the Reef-Spec titanium probes gives an indication at all times of the actual water level relative to the sensor, which can be seen on the ReefBeat App at all times.
The temperature sensor integrated in the ATO+ sensor has been pre-calibrated to give an accuracy of ±0.1°.
Safe, Powerful and Quiet ATO Pump - Cylindrical design with diameter of 4.5cm / 1.8” to fit inside standard jerrycans.
Leak Detector The highly sensitive, Reef-Spec leak detector with saltwater resistant titanium probes detects the full range of waters from RODI to seawater.

Rank No. #5

SKEMIX Auto Top Off Water Filler Aquarium Mini ATO System Fish Tortoise Tank Water Level Controller No Wiring Float Valve

When you are on a business trip or traveling, use our water compensator to avoid water shortage in your fish tank, aquarium tank, tortoise tank, or other tanks.
Better than a float valve, no wiring or power required, takes less space.
Easy to use, practical and interesting. Just screw the compensator to a water bottle, then stick it to the tank.
When the water level drops to reveal the shorter tube, the water in the bottle automatically flows into the tank due to pressure difference.
Each compensator comes with 3 replaceable slots, suitable for 4 kinds of tank thickness: 4mm, 6mm, 8mm, and 10mm. For other thickness, you need to prepare extra gasket.

SaleRank No. #6

MagTool Optical Sensor AUTO TOP Off(ATO) with Upgraded QST Tech and Smart ETFT Algorithm for Both Reef and Fresh Tanks(MT-360P)

Compact size - the entire optical sensor unit ONLY 0.8 inches diameter. The unit works on rimmed and rimless tanks, and as well as sump tanks. The dual precision optical sensors are 0.1 cm apart, which enables it to monitor the level fluctuation precisely (less than 0.6cm difference)
New and Improved Features - Upgraded ETFT (Extended Time Filling Technology), AFT (Anti-fluctuation Technology), and QST 2.0 (Quick Security Technology). With all these new upgrades combined, our ATOs are far superior and safer. ETFT recognizes your tank size after it first initialized. Working alongside the ETFT, the AFT will be able to decide how long it takes to refill your tank without over-filling it when the QST alarm is triggered
QST 2.0 provides real-time protection against overfilling and pump dry run. The controller will give a visual alert and stop the pump immediately when it senses a refilling time more than 6 times longer than the time calculated by ETFT. QST can detect a malfunction of the sensor/controller or even an empty reservoir.In version 2.0 we incorporate ETFT feature and not relying on first filling time from version 1. Flooding barely happens when following the instructions carefully.
Everything you need is included in the package. Powerful magnet supports 15mm thick glass wall. Check valve prevents water from back flowing from the tank. Hose holder allows you easily secure the tubing. Powerful 70gph water pump can lift water up to 2.5 m high.
12-months Warranty: There is 12 months warranty for the item. No worries about the after-sale issues.

Rank No. #7

MagTool Aquarium Auto Top Off System, Upgraded Version MT-Duetto2 Aquarium ATO with Dual Optical Sensor for Both Reef and Fresh Tanks(Duetto V2)

MT-Duetto2 is an upgraded version of MT-360P, features the external controller with a physical buttons, which supports one-touch pause, allowing users to conveniently pause the system during aquarium maintenance. With the built-in buzzer in the controller, users are directly alerted to any issues or risks. In comparison to the previous version, the LED indicator lights have been integrated into the external controller, effectively eliminating light pollution within the aquarium.
Compact size with integrated 1mm high-precision dual optical sensors. With a footprint of only 0.8 inches, it occupies minimal installation space, making it suitable for both rimmed and rimless tanks of all sizes. The dual optical sensors: one for monitoring water replenishment and the other for anti-overflow protection. This ensures that evaporated water is promptly replenished, maintaining a stable water level in the aquarium while effectively preventing overflow issues.
Inherits the advanced algorithms from its predecessor, the MT-360P. During initialization, the product can identify the size of the aquarium. Based on the aquarium size, it calculates the required duration for water replenishment and sets the timeout duration for water replenishment alarms. In combination with the anti-overflow sensor and the QST 2.0 anti-overflow algorithm, it provides a dual mechanism to ensure anti-overflow safety.
All Necessary Accessories -12V DC water pump (1.5x1.5x2.0inch, 74GPH, 8.2 ft head), power adapter, anti-siphon check valve, water pipe (1.5m), mounting cracket, instruction manual, ATO controller
Reliable After-Sale Service - Provide one-year warranty service for this product (including water pump)

Rank No. #8

XP Aqua Duetto 2 Dual-Sensor Complete Aquarium Auto Top Off ATO System

Rank No. #9

B BUBBLEFIN Rimmed or Rimless Aquarium Universal Auto Top Off Water Replenishing Bottle Holder

Great for rimless and rimmed tanks both. Fit for most Petco and Petsmart rimmed tanks.
Designed based on the principle of differential pressure to automatically refill. Most Soda Plastic water bottles will work.
Cannot use soft soda bottle. The soft plastic bottle will shrink itself when along with water refill and it is non stop drilling. Must use hard plastic bottle
New Screw-Design makes the holding on glass better. Screw-free/slot design often cause bottles to lean one side when using big bottles, which may cause glass breaking. Screw-design allows bottle position adjustment.
Suitable for variety of tanks. From rimmless tank to most common rimmed tank, 10-gallon, 20-gallon, 40-gallon, 75-gallon.

Rank No. #10

hygger Aquarium Alarm Auto Top Off Kit, Fish Tank Smart ATO Water Pump Auto Refill Water and One-Key Drain Water, Water Level Monitor Two Pairs of Protection Sensors for Saltwater Freshwater Tank

🐟SOUND ALARM: New security technology, two optical sensors monitor the water levels, double protection, can attract your attention quickly. When it occurs below situations, it will make a loud beeping noise to warn you: ① The water pump that placed in the bucket is out of water. ②Water pump's electric wire loose. ③External sensor is out of water. ④Fish tank water level is higher than the auto top off monitor pump.
🐠LED INDICATORS ALARM: The red light is constant brightness, which means it is working normally,off is not ok. If other lights flash, it indicates that there is an issue with the device, which needs to be checked and corrected with reference to the manual. YELLOW LIGHT: water pump drain water; BLUE LIGHT: water pump refill water; GREEN LIGHT: external optical sensor; RED LIGHT:power adapter.
🐡DOUBLE APPLICATION: Auto refill and one-key drain water. Put the water pump in the fish tank, and plug the water pump cord into the upper(Yellow light hole) to drain water. On the contrary, put the water pump into the reserve water tank and plug in Blue light hole for auto refill water, and plug in external optical sensor to avoid water shortage in the reserve water. “M” button, PAUSE/CHANGE WORKING MODE.
🐢SIMPLE TO USE: Easy to install and use, no complicated programs. Connect water pump, external sensor and power supply to monitor and it’s ready to run. Suitable for saltwater and freshwater tanks(up to 60 gals). Can be installed in a cabinet filter or directly on the aquarium edge. Because of monitoring, no longer have to worry about the lack of water in the spare water tank placed in a hidden location.
🦐QUALITY MATERIAL: ATO MONITOR * 1,super strong magnetic, firmly fixed on the wall of the fish tank (≤12mm). WATER PUMP * 1, DC 12V 5W, H.max:6.5FT, Q.max:74 GPH. HOSE * 1; EXTERNAL OPTICAL SENSOR * 1,widen the edge, the monitoring is more precise. POWER ADAPTER * 1,DC 12V 1A. UNIVERSAL HOLDER *1, for 3/4 inch thickness tank, hose holder. USER MANUAL *1.

Rank No. #11

ZAOJIAO Auto-top-Off ATO Solution Auto Water Filler Adjustable Float Valve Mounting for Aquarium Sump

The ATO system is easy to hang on to your aquarium sump.
It is suitable for 5 to 18mm thickness of aquarium.
Pressure: 0.02-0.8MPa.
Material: Polyethylene Plastic and Acrylic.
The range of Water level from aqurium sump top is 0-25mm or 0-10".

Rank No. #12

Kamoer New ATO One 2 SE Smart auto top Off System Silent Water Replenisher Water Level Controller for Fish Tank Water Tank Aquarium

Kamoer's new upgraded ATO one 2 se automatic water refill is a great addition to your home fish tank! It has a water refill timeout alarm function to prevent water level overflow due to sensor failure.
This ATO is equipped with: S1: Optical level sensor to identify water refill, S2(not included,optional sensor): Refill bucket level sensor, S3: Optical level sensor to prevent overflow, DC12V: power input, Pump: connect to refill pump or refill solenoid valve, Power: power indicator (green), Filling: refill indicator (blue), Alarm: alarm indicator (red). Power: power indicator (green), Filling: fill indicator (blue), Alarm: alarm indicator (red)
In normal daily use, S3 sensor does not work, S3 is installed in the high used to prevent overflow, to play a role of protection. S1 is is to detect the lowest water level sensor, used to identify the refill water. S2 is the refill bucket level sensor, to prevent the refill bucket shortage of water.
Compared to the old ATO, we have upgraded two parts of this ATO. 1. replaced the original submersible pump with a new anti-dry submersible pump. 2. replaced the new sensor, the new ATO uses a more accurate optical level sensor more responsive, which can effectively reduce the generation of faults.
Please install the sensor correctly (there is a picture illustration in the main picture), ATO may malfunction will not work. The height difference between the refill bucket and the bottom/master cylinder should not exceed 1.5 meters, and the refill bucket level should not be higher than the bottom/master cylinder level as much as possible .

Rank No. #13

Tunze 3155.000 Osmolator Auto Top Off System

Made in Germany

Rank No. #14

JEBAOJECOD Smart Aquarium Auto Top off Water Refiller System,Water Replenisher Water Level Controller for Fish Tank(Jebato-150) Black

JEBAO ato,smart aquarium automatic top off system,water level controller for fish tank,
With 42gph DC12Vquiet pump,5 ft max lift,silent water replenisher
6.5ft soft tube with tube holder ,with siphon break and magnet mount sensor ,tank thickness up to 1/2" (12mm)
Automatic water refill and quiet operation,suitable for salt water and fresh water
Use smart magnet mount optical sensor,LED light alert,

Rank No. #15

Kamoer ATO One SE Smart Automatic top Off System Silent Water Replenisher Water Level Controller for Fish Tank Water Tank Aquarium(with Submersible Pump and Sensor)

Kamoer ATO one se automatic water replenisher, a good helper for the fish tank at home!It has the function of adding water overtime alarm to prevent water level overflow caused by sensor failure.
This ATO is equipped with S1 float sensor, also called anti-overflow sensor (to prevent excessive water replenishment and water overflow) and S2 optical sensor (also called water replenishment sensor). Usually note: In the case of ATO running normally, S1 is not working, and the float state is sinking. S2 works.（Sensors may fail if not properly installed, make sure they are properly installed (or unplugged and reinstalled).）
In daily use, S2 is a sensor that detects the lowest water level. The function of S1 is to cause the float to rise when the water level exceeds the S2 optical sensor and reaches the S2 float sensor when S2 fails (for example, foam is generated in the sea tank, etc.) Alarm, stop refilling.
Please install the sensor correctly (the main picture has a picture description), otherwise the product will not work. And the distance between the two sensors is not less than 10cm. The height difference between the make-up bucket and the sump/master tank should not exceed 1.5 meters, and the liquid level of the make-up bucket should not be higher than the liquid level of the sump/master tank.
Some problems mentioned in product reviews: such as quality assurance, installation problems, and product failure to work, etc., please watch the demo video and detailed introduction on the details page. We give a detailed explanation on the details page.

Rank No. #16

Clscea Aquarium Auto Top Off System Water Filler Compensator Blue, 1pcs

Great for nano tanks, use with the principle of differential pressure to automatically refill water, simple and practical. You need to prepare 0.5-1.5L (16.9-50.7 FL Oz) plastic water bottles such as EVAIN / Coca Cola / Fiji yourself.
Built-in noise reduction device can effectively reduce noise. (Note: not completely silent).
Screw-free, no damage to the tanks. Made of corrosion-resistant ABS material, which is also usable in saltwater. The length of the tubing (manually cut) allows you to adjust the water level.
Suitable for tanks with 3-10mm /0.12-0.39in wall thickness. Note: Incompatible with rimmed tanks and curved fish tanks; and tanks with 3mm/0.12in or 5mm/0.2in thickness wall need to use the self-adhesive gasket (included).
A reliable gadget during business trips or travel. Compatible with fish tank, tortoise tank, planted aquarium, saltwater aquarium, etc. For tanks longer than 40cm/16inch, it is recommended to use 2 refillers together.

SaleRank No. #17

DIGITEN ATO System, Smart Auto Top Off System, Fish Tank Sump Water Filler Refiller, Automatic ATO System for Aquarium with Pump,Water Replenishment System, Smart ATO System for Fish Tank

💧💧【Simple, Complete, Smart Automatic Top Off System】 aquarium automatic water supply system, super easy installation and maintenance. Suitable for aquariums up to 5/8"(16mm) thick, durable PC material holder to prevent move, adjustable bracket on holder make different water levels possible.
💧💧【Relay Control】 precise dual float water level sensor for overfilling protection. When the water goes below the minimum water level , the power will be activated, the pump automatically works, and cut off once the water level reach to maximum. The second float ball will work when the first float ball fails.It can effectively avoid the influence of wrong information and is more reliable than other sensors.
💧💧【Siphon Break】 The siphon break is optional installation part. It is recommended that the water level of display tank be higher than the reservoir, and DON’T leave the end of the water supply pipe in the water, otherwise, it will siphon after the pump shuts off, if so the siphon break must be installed at the end of the water supply pipe.
💧💧【Plug-and-Play with all parts included】 Everything you need is included, it will also come with a pump and a ETL listed power adapter. Safely keep sump water levels stable, no moving parts that can fail.
💧💧【Widely Used】Suitable for all kinds of fish tanks, aquariums, sumps, etc. The range of water level from aqurium sump top is 0-17cm or 0-6.7".Suitable for aquariums up to 5/8"(16mm) thick, save you a lot of time to enjoy your life. The Smart ATO Complete Kit will never make water overflow your tank, it is especially suitable for the sump with a lot of evaporation. 12 month warranty!

Rank No. #18

DIGITEN Auto Top Off System Aquarium ATO Water Filler System Smart ATO Refiller Fish Tank Automatic Water Level Controller Coral Reef Tank Automatic Top Off

🐠【Easy to Install】The aquarium auto top off system is extremely to install and maintain. Easily install on terrarium with a wall thickness of no more than 5/8 inches (16 mm). The range from the top of the tank to the water level is 0-6.7 inches (0-17 cm). The durable PC material adjustable bracket can be fixed in the terrarium according to different water levels.
🌿【Integrated Design Without Setting】Plug and play, easy operation. Anti-overflow protection design and will automatically cut off power when water level is too high.
💧【Double Protection】Accurate dual-float water level sensor can provide over-filling protection. When the water level drops below the lowest water level, the power supply will be activated and the water pump will work automatically and shut down when the water level reaches the highest water level. When the first float fails, the second float will work.
🐚【Relay Control】The controller of the ato system integrates a relay and a stable circuit to protect the water pump and the water level switch more effectively.
🦐【Widely Applications】It is widely used in various aquariums, sump, fish tanks, coral reef tanks, etc. Rest assured your product is covered by one-year warranty.

SaleRank No. #19

MagTool Platinum Serial Optical Auto Top Off System(ATO) with Smart SPT Algorithm and Beep Alarm(MT-200)

Compact size. The dual optical sensors system monitors your tank water levels closely for over-fills. When the sensor sees water level at "LOW" position, it starts filling the tank immediately. The “HIGH" sensor provides real-time protection against over-fills. The platinum model uses advanced external optical which can detect the water level through the glass wall on the outside. There are no more loose cables inside the tank.
Smart algorithms. AFT (Anti-fluctuation Technology) and SPT (Single Pumping Time) working together in tandem to ensure the pump works in real-time to add the right amount of water. At the same time, SPT and QST working together to prevent overfill and dry run. Having these features, our pumps will last longer
Built-in LED indicator, smart button and alarm buzzer. equipped with a smart button, you can pause the ATO's function temporarily when you perform maintenance on your tank. 3 different LED colors to indicate its working status. When errors happen, buzzer sets off alarms to remind you.
Accessories are included. Powerful magnet provides strong suction support even on 15mm thick glass wall. Hose holder allows you easily secure the tubing. Powerful 70gph water pump can lift water up to 2.5 M high. Device is easy to use. After finishing device initialization, you can forget about it.
Attention! The optical sensor ONLY works on transparent glasses. If your tank is not transparent, you need to choose our basic model ATO-360. It is designed for both rimless and rimed tank. The device’s overall width is 1.2 inches long. The target water lever is between "LOW" and "HIGH" positions, so the target line must be 0.4 - 0.6 inches from the edge of the tank.

Rank No. #20

1/4 inch Plastic Adjustable Tube Float Valve Kit for Aquarium Water purifiers , Auto Water Filler Controller Auto-top-Off System, RO Water Reverse Osmosis System (1 Float + 5 Connect)

The float can be manually adjusted for side or top use，No tools required , easy to use . Remove the white needle and adjust the direction of the float to change the controls you need
This auto off Float Valve system is easy to install on to your aquarium sump，only suitable for the aquarium which is under 11mm thickness glass.
Standard fitting for water filter systems using 1/4" OD Water tube
The Tube Float Valve diameter is 5/8"，It can be mounted on the side or top , Comes with a O-ring, don't leak.
Material: Polypropylene Plastic Tubing , Non-toxic ingredients , Odorless and tasteless

Last update on 2023-08-03 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best Aquarium Auto Top Off?

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We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Aquarium Auto Top Off that you consider buying. Your questions might include the following:

Is it worth buying an Aquarium Auto Top Off?
What benefits are there with buying an Aquarium Auto Top Off?
What factors deserve consideration when shopping for an effective Aquarium Auto Top Off?
Why is it crucial to invest in any Aquarium Auto Top Off, much less the best one?
Which Aquarium Auto Top Off are good in the current market?
Where can you find information like this about Aquarium Auto Top Off?

We’re convinced that you likely have far more questions than just these regarding Aquarium Auto Top Off, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Aquarium Auto Top Off, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Aquarium Auto Top Off. Make sure that you are only using trustworthy and credible websites and sources.

We provide an Aquarium Auto Top Off buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Aquarium Auto Top Off currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of Aquarium Auto Top Off has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an Aquarium Auto Top Off?
Specifications: How powerful they are can be measured.
Product Value: This simply is how much bang for the buck you get from your Aquarium Auto Top Off.
Customer Ratings: Number ratings grade Aquarium Auto Top Off objectively.
Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Aquarium Auto Top Off.
Product Quality: You don’t always get what you pay for with an Aquarium Auto Top Off, sometimes less, and sometimes more.
Product Reliability: How sturdy and durable an Aquarium Auto Top Off is should be an indication of how long it will work out for you.

We always remember that maintaining Aquarium Auto Top Off information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

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FAQ:

Q: Is there an auto top off system for saltwater aquariums?

A: Auto Top Off Systems are a great way to automate the addition of water to your saltwater aquarium that is lost due to evaporation. Bulk Reef Supply carries a variety of pumps and controllers to make this an easy step in your tank maintenance.

Q: How does an auto top off reef system work?

A: An auto top off (ATO) system automatically detects the water level in your reef tank, and then it also automatically replaces the lost water so that the water goes back to the optimum level. It relieves you of this bothersome daily chore, as it can take a lot of effort lifting buckets of water and wiping down spills.

Q: Which is the best auto top off system for nano tanks?

A: The AutoAqua auto top-off system is a simple but highly effective product that has been specifically designed for nano tanks. It is one of the smallest auto top-off systems in the market today. Despite its size, however, it comes with virtually everything that makes an auto top-off system work.

Q: Which is the best auto top off system?

A: Best Auto Top-off System Reviews. 1 1. AutoAqua “Smart ATO Micro’ Auto Top-off System. The AutoAqua auto top-off system is a simple but highly effective product that has been … 2 2. Hydor Auto Top-off System. 3 3. Tunze USA 3155.000 Auto Top-off System. 4 4. Tunze USA Auto Top-off System. 5 5. Ultralife Mechanical Float Switch. More items