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AutoAqua Smart ATO Micro Automatic Top Off System


Item #: CV12118

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The AutoAqua Smart ATO Micro is the smallest auto top-off system available today. This makes it especially great for nano aquariums that don’t have a lot of extra space inside the tank.

How small is it? The level sensor is about the same diameter as a penny! If you install the sensor in your Nano tank, you’ll never notice it’s there. The magnetic mounting system is tiny but works on glass, plastic and painted surfaces up to ½" thick. The optical sensor has no moving parts. No float switches. Nothing to get stuck. The sensor can be mounted in a sump or directly in the aquarium.

Installation is quick and easy; no programming or adjustments are needed. Simply place the water level sensor at the desired water height in the sump or aquarium. As the water evaporates the sensor will turn on the DC water pump in your freshwater reservoir. You can use a bucket or an aquarium to hold the make-up water. When the pump refills the aquarium to the desired height, the Smart Mini Controller shuts off the pump.

AutoAqua incorporated their QST (Quick Security Technology) into the ATO’s monitoring system. The Smart Mini Controller records the time it takes to top off the aquarium the first time you turn it on. If at any time the refill pump runs longer than three times the initial top off time, the system sends out an audible alert and turns on a blinking red LED. The refill pump also includes a siphon breaker to prevent backflow into the reservoir.

What we really like about the Smart ATO Micro system:

  • Very tiny sensor – ideal for small marine and freshwater aquariums
  • Kit contains everything needed right out of the box – refill pump, 6.5’ hose, sensor, power adapter and magnetic mounts for the sensor and refill tubing
  • Red LED and audible warning alert and blue LED for normal operation
  • Easy set-up
  • Water level memory can be reset if necessary
  • Quiet operation

AutoAqua Smart ATO Micro Features:

  • Smallest ATO on the market
  • Maintains proper salinity in marine aquariums
  • Practically invisible in the aquarium
  • Patent-pending optical sensor
  • No moving parts
  • Simple magnetic mount system
  • Plug and play set-up
  • Quick Security Technology warns of malfunction
  • 1-year warranty

AutoAqua Smart ATO Micro Specifications:

  • Brushless DC refill pump with 30,000-hour lifespan
  • Maximum head: 6.5 feet
  • Accepts tubing with 6.5 mm I.D.
  • Max flow rate: 74 GPH
  • Power consumption: 4.5W@12 volts
  • Power cord length: 5.5 Ft.
  • Pump cord length: 5.5 Ft.

Manufacturer information

AutoAqua, one of the outstanding intelligent aquarium providers in the world, aims to design and manufacture small, safe and smart automatic aquarium products. To realize aquarists’ dreams, we also develop an aquarium interactive system based on WiFi connection, which enables aquarists enjoy an easy aquarium life with enormous fun.

Smart ATO and Smart ATO micro are a unique top-off system which features easy installation and maintenance. They employ the Quick Security Technology providing real-time protection to prevent any failure situation. The Smart ATO comes with the patented contactless digital sensor that monitors and automates refilling evaporated water. The Smart ATO Micro is designed especially for nano tanks has an incredibly small sensor uniquely coupled with a magnet.

Smart AWC Touch, one of their newer products, is an automatic water change and auto top off all-in-one system. It reduces aquarists’ time and effort doing water changes and topping off their tank. All a hobbyist needs to do is set up optical level sensors and pumps and program their water change process using an included LCD touch panel. Then you can perform water changes automatically according to your desired frequency and refilling speed. Smart AWC Touch also employs Quick Security Technology providing real-time protection to prevent any failure situation.

5 Stars


Reviewed on
August 18, 2020

Yes, I would recommend this.

Very good ATO system

Pros: Small, quiet, sensor instead of moving parts

Cons: Only con so far is that my pump stopped working.

Great system. No moving parts so won’t have issues with dry salt. Works great little pump impressed me with the power. Pump stopped working today and called marine depot customer support and they immediately contacted the manufacturer. Waiting on response

Was this review helpful? 1 0


Reviewed on
August 05, 2020

No, I would not recommend this.

Works until it doesn’t

Mine broke after a year.

Was this review helpful? 0 0


Reviewed on
July 18, 2020

No, I would not recommend this.

life span short

Pros: works fine when running

Cons: 6 month life span

To expensive to work only for 6 months. Had in a 5 gallon reserve fresh water tank for top off. Ran fine for 6 months then stopped pumping. Now I am back to manual top offs. Do not plan on spending this amount of cash again on this item.

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Reviewed on
July 02, 2020

Yes, I would recommend this.

Reliable and efficient

Pros: Quite,Efficient,Reliable

Cons: Always pumps just a tiny bit of water each time the system is plugged in regardless of level.

I purchased this product for my 32 BioCube. Set the sensor in the return chamber and haven't done anything but add RO water to the reserve since.

Was this review helpful? 1 0


Reviewed on
June 22, 2020

Yes, I would recommend this.

Great ATO for a Biocube 32

Pros: Accuracy, size

Cons: None so far.

The sensor is the perfect size for my Biocube 32, fits great in the pump chamber on the back wall. Keeps the tank topped off and is accurate and not overly sensitive.

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Reviewed on
April 21, 2020

Yes, I would recommend this.

Best thing ever!

Pros: Easy to setup, small size sensor

Cons: Wished it had a pause button

This is the best thing ever! Works like a charm. When I opened the box I saw the little pump and said to myself "This is junk" well I was wrong. It pumps with no issues from the ground to my tank which is about 4 feet below. The sensor works great and I love the beeping alarm features that warm me when the pump has been running for too long or if the pump is not running when it needs to. Great product!! I use it as an ATO and also when doing water changes. The only thing I would change is that I would add a pause button. When I am doing a water change I have to manually unplug the pump but I guess this could be fixed if I added a power center.

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Reviewed on
January 28, 2020

Yes, I would recommend this.

Works great

Pros: Pump is small but efficient

Works just as it is designed to do. Only issue I have is that the audible alarm for low water is ear piercing and pisses my dog off to no end. It's loud and annoying for a reason though (to get your attention), so I won't dock it for that.

As for others saying the siphon breaker leaks all over the floor, well if you read the directions you would have realized that it clearly states that the siphon breaker needs to be placed on the hose inside the reservoir so that when it breaks the siphon, the extra water just returns right to the reservoir.

Was this review helpful? 2 0


Reviewed on
January 14, 2020

Yes, I would recommend this.

Great ATO for small tanks

Pros: Very easy set up and maintenance

I have been using this ATO for some time and have never had problems. It is very easy to set up and very easy to clean when needed. Works great for smaller nano/pico aquariums and would probably be ok for larger ones too, would just take longer to fill up.

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Reviewed on
September 04, 2019

Yes, I would recommend this.

Best ato on the market.

Pros: Excellent

Cons: Non

This ato can be used on any size tank. For the price it’s very reliable, easy to setup and use. You can set it up in less than five minutes. I bought one of these years back when they first came out and never had a problem till the pump went out.

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Reviewed on
July 02, 2019

Yes, I would recommend this.

Best ATO on the market for nano tanks

Pros: Everything

Cons: Nothing

hands down best and safest ATO i use it along with the auto aqua safe secruity and never have to worry of an overflow AWESOME PRODUCT.

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