IceCap Dual Optical ATO - Auto Top Off Controller

I am very happy with the performance of this ATO. It seems overpriced, but it INCLUDES a pump, which most don't even at the same price point. The fact that it is a complete plug & play system, with no programming, is excellent. It is in my display tank under LED lighting and is working flawlessly. The only funny thing is that clownfish feeding at the surface can set it off for a couple of seconds. I guess they make just enough ripples to trigger the low side fill. Also, the blue LED light on the controller module is very bright, maybe too bright for a bedroom tank. A piece of tape fixed that problem. The included plastic tubing clip won't fit the rim of the glass, so I bought a "probe holder"Aquarium Tank Ph Orp Probe Electrode Holder, Hose Holder Fixture Acryl (4 Probe) that has thumbscrews and holds the tubing great. Lastly, the tubing is very kinked in the package, but soaking it in a hot water bath for 10 minutes will soften it up enough so you can straighten it out.

Install was straight forward but I was really disappointed to wake up at 5am due to the alarm going off. I realized the pump had continued to pump past both sensors! Thankfully the controller has a finite “on” duration but will beep to no end when that occurs.

ATO has been installed for about 1 month and working well. Its currently installed in a Red Sea Max Nano and is plenty to keep water levels stable. Easy to turn off when doing maintenance or placing hands in water, as the alarm will sound if water level rises too much. Pump is strong enough to pump up from the cabinet floor to the tank. Overall happy with the purchase

Purchased this and hooked it up, worked for 5min and then started overfilling. Contacted icecap/coralvue and after two weeks of back and forth and trying different troubleshooting I got a new sensor, didn't fix it. Then got a new controller and worked for about a week and now back to the same issue of overfilling. Unsure if I will be purchasing another ice cap product again.

I have this set up in my 20 long reef display (no sump) and it works very well! Easy to set up and very sensitive. My salinity stays constant now. The mount and sensors are very small, so it works well in a nano tank without a sump. My only issue with it was with the pump when I first tried to use it. The impeller wouldn't turn for some reason. I pulled it apart and put it back together and it has worked since. I've had it set up for a week and half so far. If anything changes, I'll update this review.

Was pretty excited to receive this, spent a bunch of time rerouting cords and making everything all neat, to have the thing not work right out of the box, no matter what I tried the alarm would not turn off. For $130 bucks the only thing that was nice was the box, returned the same day

Set up was a breeze, has been working flawlessly so far, the little pump is actually very strong. I would definitely recommend this.

I like the IceCap ATO. I've had it running for a couple of months now and have had no issues with it at all. The only time I can hear it run is if the house is dead quiet and I'm in the same area as the tank or if I'm standing next to the tank. Other than that it's pretty quiet. The little pump that comes with it is sufficient enough to lift the water from the bottom of my ATO reservoir to the top of my 40 gallon tank which is about 4-4.5 feet of head lift. It came with everything you need to get it setup and running. The sensor mount is magnetic. I use a natural bristle 1" paint brush to gently clean the sensors periodically so I never even have to remove them.THE CON: The reason I only gave four stars is because this is not specifically designed to accommodate a tank that has a rim around it. However, it can be configured in such a way that it becomes a non-issue. For one, the bracket for the hose end that goes into the tank does not fit properly on a rimmed tank, so you will have to use an alternative method to secure the hose so it stays put. Secondly, the way they instruct you to mount the sensors in the bracket is not ideal for an aquarium with a rim. For me personally, when configured as they suggest I feel that the distance between the sensor triggers is too great for a rimmed tank. What I ended up doing is positioning both sensors so that they point up and then gave the bracket a slight turn to the left so that the low level sensor sat a tad more in the water and the high level sensor sat a tad more out of the water.So far I have no complaints regarding the functionality of this ATO and I would recommend it to anyone who is not ridiculously picky about having to mildly tweak a product to get it the way they like it..