Smart ATO - Auto Top Off System - AutoAqua

AutoAqua Smart ATO - Auto Top Off System
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  • AutoAqua Smart ATO - Auto Top Off System
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  • AutoAqua Smart ATO - Auto Top Off System What's in the Box
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  • AutoAqua Smart ATO - Auto Top Off System Pump
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  • AutoAqua Smart ATO - Auto Top Off System Box

Smart ATO - Auto Top Off System - AutoAqua

74% Recommend this to a friend (46 of 62)

SKU: 208108

reg. $159.99

Special Price: $143.99

In Stock: 62
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Quick Overview

Great for small tanks and where space is limited - the Smart ATO is a compact controller and sensor in one unit to keep you water at a safe level while maintaining proper salinity. Powerful magnets hold the unit in place at the desired water level in your tank or sump. Music alarm sounds if unit detaches from tank or if pump runs for too long.
  • Patent-pending contactless optical sensor - no moving parts to fail, zero chance of leaking voltage

  • AFS Technology - Automatic Feedback System for real-time fail safe protection

  • Controller/Sensor is less than 1 1/2" in diameter

  • Works on sumps/tanks with wall thickness up to 1/2"

  • Clear Acrylic or Glass

  • DC Brushless Feed Pump - 74 GPH

Full Details

Smart ATO Manual


What's in the Box

  • Controller/Sensor
  • Power Adapter
  • DC Brushless Pump
  • 6.5 Ft of 5/16" ID Water Tubing with Universal Holder


DP-200 DC Feed Pump

  • Flow Rate: 74 GPH
  • Power: 4.5W@DC 12V
  • Max Head: ~6.5 Ft (200 cm)
  • Brushless pump design for maintenance-free operation, high speeds - great around electronically sensitive equipment


Manufacturer's Warranty

  1. 1. Product is guaranteed for two years from date of purchase at normal operation
  2. 2. Warranty is not transferable
  3. 3. Any incorrect operation will not be warranted and will result in a repair fee
  4. 4. All warranty repairs are performed by CoralVue
  5. 5. Guarantee is effective at the date listed on your sales receipt


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  • Great concept, poor performance By Keith on 10/27/2017

    It sounds great in theory, but in reality it has lots of issues. While the magnet held strong, there always seems to be little bubbles that caused the unit to malfunction, even past the baffles. Naturally, the bubbles sit right at the level of the sensor, perfect for messing with the ATO. I've found that float switches are much more reliable, as long as you clean them periodically.
  • False alarm By Phil on 10/13/2017

    I've had this unit for just one month and have had several false alarms. Each time you have to unplug the unit to reset. I wish I would had read the reviews before purchasing because it looks like this is a common problem.
  • Why the hassle? By GoneFishingAgain` on 10/10/2017

    All you need is a timer or WiFi power plug for the pump in the reservoir. If you need to reduce the amount of water flow to the tank/sump, just add a control valve along the water tube. It's a lot less equipment and wire than a clumsy ATO
  • One of the best additions to my system! By seth on 1/29/2017

    Very easy setup! Plug n play unlike others with the outdated and failure prone float switched setups.
  • great product & easy By The master to be on 11/21/2016

    I purchased one of these units about a year ago and will be setting up another tank soon so I purchase another one in preparation. The unit is easy to set up specially in a small cramp sump and has been very reliable as to alerts etc. Highly recommend !!!!!
  • Works as described By Zack on 11/17/2016

    Easy to set up, simple to use. Has worked great for the last two weeks since my purchase. Only suggestion is the magnet is not very strong, so be careful with it accidentally moving.
  • Siphoning By Clint on 11/17/2016

    Don't buy. I used some store credit to get this (from another company) and I tried installing it today for a week long vacation. Already back-siphoned once! You'd think they'd include a check valve....

    If I come home and the carpet isn't wet, I'll keep it, Otherwise....
  • DON'T BUY NOT A QUALITY PRODUCT By Terry on 6/27/2016

    I have had the ATO by AUTOAQUA for almost 1 year. During this time I had to put of with numerous false alarms each week and had to unplug and plug it back in to get it to work. Then it started to run and not shut off. It almost overfilled my sump on several occasions and would empty the fresh supply and the pump would keep running when the water was 4 inches above the control unit. It upset the salt balance in my tank and caused stress to my corals and fish. I contacted the customer service rep, they have no phone contact so I had to do it by e mail. I explained the unit would start of fill the sump and continue to pump water into it until the fresh water was empty and the sump was at overflow level and the pump would continue to run dry until I unplugged it. I had questions from the rep over a week, the rep was determined it was a syphon problem - what part of the pump will not shut off is so hard to understand. Finally he said he would send a new controller but they were out and would send the request to the shipping department and send one when they get it in. That was about a month ago and I am still waiting.

    The product is not high quality and the customer service is worse - avoid this product.
  • Probably Not By pet22 on 5/18/2016

    I guess the right question to ask is would i buy this again and the answer is no. That being said - it ran for over a year just fine. Then the Wet side Magnet split the case and rusted. This caused the lens to be clouded and faulty readings. Apparently there customer service is going to replace the item. If they do that for me goes a long way as I made the claim just over the 2 year point. It has a 2 year warranty.

    Personally I love the idea of the size and how it actually works, price point is ok, just seems they need some improvements in their manufacturing.
  • Awesome and reliable By A Orf on 3/31/2016

    I don't know why anyone would give this a bad review. I think it may be user error or a flawed system, but mine has been absolutely perfect.
  • Excellent By Tully on 1/7/2016

    Simple to set up. Over two years with no problems.
  • Frustrating alarm-do not buy! By jammerdave on 1/7/2016

    Alarm goes off everyday- pain in the *** , thought this was supposed to make things easier


Ask a question

Product Questions

Will it hurt the pump if it runs dry? Obviously this is not a situation I want, but it happens.
Question by: Erik on Dec 5, 2013 6:38:00 AM
Hi Erik,
Its not great for the pump in the long term but the ATO does have an alarm that will go off and disable the pump should the pump run dry.
Answer by: Bulk Reef Supply on Dec 5, 2013 6:38:00 AM
Any chance I can hook up a different pump, like a peristaltic?
Question by: Steve on Dec 8, 2013 2:42:00 AM
Hey Steve,
Not with this particular model of ATO. If you want to use your own pump then the Innovative Marine Hydrofill would do the trick as well as the Tunze osmolator (with the addition of the switch socket adapter).
Answer by: Bulk Reef Supply on Dec 8, 2013 2:42:00 AM
My AIO tank has frosted glass on the chamber that I was hoping to use this in. Will it will work on that? Or do i need to try and find a different solution for my top off needs?

Question by: Steve on Feb 19, 2014 12:35:00 PM
Hey Steve,
Unfortunately this ATO isn't going to do the trick if you don't have clear glass. Your best bet would be to look at something like the Elos or the Tunze auto top offs.
Answer by: Bulk Reef Supply on Feb 19, 2014 12:35:00 PM
Is this apex ready or can it be hooked up to one?
Question by: John on May 21, 2016 11:42:00 AM
The smart ato is not apex ready, meaning it cannot be programmed via apex. However, you can control its status with the energy bar 8.
Answer by: Carter (Admin) on May 24, 2016 1:36:00 PM
How much are replacement pumps?
Question by: Rick on May 10, 2015 4:39:00 PM
Great Question! You can find replacement parts directly from Coralvue for fairly cheap, here is a link to the replacement pump:
Answer by: Jason (Admin) on May 11, 2015 7:17:00 AM
I am about to order this Smart ATO. Could someone reply and let me know if it comes with a pump or what I should use with it??


Question by: Jason on Feb 19, 2014 8:36:00 AM
HI Jason,
The pump is included with the ATO :-)
Answer by: Bulk Reef Supply on Feb 19, 2014 8:36:00 AM
It seems a common problem is the wet side magnet splitting and rusting.

Can I buy replacement magnets and swap them out before they go bad? Or could the sensor module be siliconed to the tank instead of using a magnet?
Question by: Randy on Jun 30, 2016 12:17:00 PM
Great question!
Replacement components can be found through directly. As for modification it may work but we cannot recommend for replacement and warranty purposes.
Answer by: Connor (Admin) on Jul 1, 2016 9:44:00 AM
What is the length of the cord that runs from the power supply to the smart controller?

What is the length of the cord that runs from the smart controller to the DC pump?
Question by: Robert on Mar 10, 2014 1:22:00 PM
Hi Robert,
The cord for the power supply is 48" and the cord to the pump is 72".
Answer by: Bulk Reef Supply on Mar 10, 2014 1:22:00 PM
How does this unit handle water changes? Do you just unplug the unit? or is there a power button to turn it off. (assuming your water change drain the water from the sump return area where this unit would be mounted)
Question by: Andy on Mar 26, 2014 3:19:00 AM
Hey Andy,
This unit is the same as pretty much any other unit, you simply unplug it when you do a water change. If you happen to have a standard aquarium control you could also have the ATO setups for a standby mode. For example on my Apex I have a standby mode D that runs for 30 minutes and when activated it cuts power to all my pumps, heater, ato, etc. Basically shuts my tank down for a half hour while I do my water change.
Answer by: Bulk Reef Supply on Mar 26, 2014 3:19:00 AM
how well does the Autoaqua work with jaboe wave maker. I wondering if the up/down motion of the water will confuse the system
Question by: Alfonso on Sep 10, 2014 5:49:00 PM
Hey There,
Great Question! That auto top of will perform best in a sump with little surface agitation. Using it in a display tank with wave makers will more than likely be an issue depending on the amount of agitation at the surface. If you have any other questions, let us know! Thanks!
Answer by: Bulk Reef Supply on Sep 10, 2014 5:49:00 PM
I have a 57 rimless (12mm glass) that goes though about 1 gallon per day. Since I am going to be installing this in my tank, I like its small size. But, will its small size be enough for my tank? If not, what do you recommend?
Question by: John Q on Jun 10, 2014 7:47:00 AM
Hey John,
When you say on your tank, do you mean that you do not have a sump? It would fit in terms of size but because of the way it works it will require the water level to be a few inches below the rim. You may also want to look at the Elos Digital Osmo Controller. It has a tiny probe that is easy to attach to an existing power cord or something in your tank and would be almost unnoticeable.
Answer by: Bulk Reef Supply on Jun 10, 2014 7:47:00 AM
WHAT IS THE SIZE OF THE "OUTSIDE" UNIT(distance from glass, extending out)? THANKS

Question by: Lewis Thompson on Jun 10, 2014 8:47:00 AM
Hi Lewis,
It sticks out from the outside of the glass by just shy of 2"
Answer by: Bulk Reef Supply on Jun 10, 2014 8:47:00 AM
Can the pump be used in a container that has a dilute kalk addition. I use a 5 gallon container with 2 tbsp of Kalk in 5 gallons of water in my current setup. Would this pump get clogged by the sediment?
Question by: Carlos on Feb 2, 2014 3:00:00 AM
Hi Carlos,
Anytime you want to dose kalk you always want the pump or the tube off of the bottom as you never want to dose sediment to the tank (forget the pump at that point, the sediment is a slurry that will wreck havoc on the pH of your tank). That said though, as long as its off the bottom you can use the pump but kalk is going to shorten the lifespan of any pump so dont be surprised if you need to replace it more often.
Answer by: Bulk Reef Supply on Feb 2, 2014 3:00:00 AM
what are the dimensions of the pump? is it small enough to fit through the opening of a 5 gallon jug
Question by: James on Feb 10, 2014 8:44:00 AM
Hi James,
Its a bit shy of 2x2x1.5!
Answer by: Bulk Reef Supply on Feb 10, 2014 8:44:00 AM
Do u have to buy a seperate
Pump for this?
Question by: nicholas on Dec 5, 2013 7:05:00 AM
Hi Nicholas,
No you do not. The ATO includes a small pump that will pump about 6ft of head pressure.
Answer by: Bulk Reef Supply on Dec 5, 2013 7:05:00 AM
Would the sensor fit in the return pump well on an Innovative Marine Nano 8 tank?

It's hard to go away even for a weekend without the sump evaporating dry if you remove the glass top to use an auto feeder.



Question by: Rick on Dec 13, 2013 6:09:00 AM
Hey Rick,
The sensor itself should fit just fine, but it needs to see threw the glass and the back panels on the Nuvo tanks are flat black so it wouldn't be able to see through it. On a tank like yours your best bet would be something like the Elos Osmocontroller which doesn't have to see through the glass and has a small easy to place sensor that will fit just fine in your tank.
Answer by: Bulk Reef Supply on Dec 13, 2013 6:09:00 AM
The guys at Reef Builders did a pretty positive review on this ATO (, but my one concern is shown in the video when power goes out. It appears to keep adding water from the reservoir to the tank/sump. Have you guys tested this out? What could be done to prevent an overflow situation? (I have a UPS, but they only last for so long...).
Question by: Dariush on Dec 12, 2013 3:47:00 AM
Hi Dariush,
If the power goes out, the pump has no power and can't add water to the tank. The only way water would continue to get added to the tank would be if the system was setup incorrectly with the reservoir water level higher then the water level in the location you are dosing too. If this is the case you would be creating a siphon and the water will continue to drain. This would happen not if the power goes out but would happen every single time you pumped water through the lines. This would be the same case with any auto top off system as well, its just the laws of physics :-)

Otherwise though, if the system is setup properly and the power goes out, it won't go pouring a bunch of water into your tank (without any power the pump doesn't even have the ability to pump said water).
Answer by: Bulk Reef Supply on Dec 12, 2013 3:47:00 AM