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

Works well as an ATO on my rimless freshwater aquarium. Using an ATO is really essential for my rimless tanks which lose water to evaporation rapidly without keeping a lid on them. FZONE help center has improved over the years I’ve been a customer, they quickly responded to a pump issue outside of the warranty period. Good product and service for the price.

This is my first time using an ATO system, and I set it up on my 65-gallon tank with a 5-gallon reservoir. Installation was pretty straightforward if you've worked with aquariums before. It works exactly as advertised so no complaints there.

Bought this because my previous ato (prism) just would not start anymore, after 2 years of doing what I need it to do. The first fzone came and just wouldn't work from the start, so I got a replacement. After getting the replacement and tuning everything to work I was getting fresh water into my display tank again. The problem was every time I would need to do a water change and had to turn my ato off I would get red and blue flashing light when turning it on again. So I would have to do the set up process all over again which was just a pain. I would have to turn everything off and hope the fzone would work. After changing the water 3 days ago and doing what I have been doing for the past month or so just to get this thing to work, well this time the fzone just would not work anymore it stays on red and blue flashing light will not engage the pump will not fill my tank back up. When you buy equipment in this hobby you're looking for things that make your maintenance easy and are reliable this product isn't it. Skip this one don't take the risk find a better replacement maybe I'm the unlucky one but going. 0-2 seems a little more than coincidence

Love how small it is and so far works great.

I can only give four stars for a couple of reasons. One is sometimes they don’t turn on when they are supposed to and they don’t always let you know when the water supply tank is empty. It’s supposed to flash red and turn off the pump but more than once I have found the pump running with no water. Just to let you know I have 4 of these and only two are acting up like this. They were past the return date by one week when I started having these problems. Can’t neither recommend nor not. Just purchase at your own risk and hope if it gives you problems that it’s within the return time limit.

Unit works great for my tank. Install was a breeze and unit is overall quiet.

Does the trick and when it works, it works well. However I have found that this thing needs a lot of attention to keep it working besides keeping the reservoir full. I find that regularly this thing will need to be reset to work again usually due to poor connections with the pump. I recommend this product but if you want something that just works, this isn't it.

I got this ATO system today and it took about 10 minutes to set up. The worst part of set up is figuring out how to manage your cables. I love how small this system this. The largest part is the reservoir which you can customize. The pipe holder feels a bit cheap but it works. I’m planning on using this for trips!