Sumpless ATO - Complete Aquarium Auto-Top-Off System for Sumpless Aquariums

Before you send this back read the instructions!I read a lot of reviews that state this problem comes up with the alarm going off. In the beginning this is true. Basically to explain what is going on this is a smart auto top off device. Me like most other people when I got this product I was constantly moving it around because I wanted that perfect spot in my tank. What I did not understand was with doing this I was messing with the auto top off feature. So the alarm was going off every time I tried to fill. Here are the steps you need to do to ensure that this product works correctly. Once you get the device set in a spot that you like and you are not going to touch it anymore unplug the power cord from it for five minutes. Plug it back in and let it go you should be fine. On a sidenote if you plug this device back in and it starts filling right away wait until it fills and unplug it again. Once you plug it back in and it does not fill the tank right away the settings are all reset and it will time the initial fill up and remember that. The device does this to protect your equipment from overfill. I would recommend this product to anybody who is new once you get the device set in a spot that you like and you’re not going to touch it anymore unplug the power cord from it for five minutes. Plug it back in and let it go you should be fine. On a sidenote if you plug this device back in and it starts filling right away wait until it fills and unplug it again. Once you plug it back in and it does not fill the tank right away the settings are all reset and it will time the initial fill up and remember that. The device does this to protect your equipment from overfill. I would recommend this product to anybody who is new to Salt water. Or anybody who does not have a sump underneath their tank.

This sumpless ATO ignores K.I.S.S. and suffers for it. The overflow blows way too hard for my 40B saltwater LPS tank. It doesn't give you a directional nozzle or the option to add one yourself at all. I really didn't need an extra powerhead I can't control with my ATO. This thing is meant for smaller tanks that don't have sumps, it's ridiculous how strong the flow is. I just needed protection from snails and stuff. There a few pros I'll go over but, mostly cons. Most of the Pros only come into play after modifications. However, the ATO itself, not including the overflow, does work and I might just end up using it independently. This will be one pricy ATO if that what happens, I will update. All of the cons regard the overflow and ultimately depending on it for the ATO being sumpless.Pros: If you seal the giant hole in the back, throw away the giant rubber block they claim is media, and use your own media, you have a decent, oversize surface skimmer.-The ATO works as advertisedCons: Ridiculously strong powerhead I can't adjust. Seriously, don't add this to something 40g or below unless you're doing SPS coral and don't care.- You have to modify it to get it to work.- There's a giant hole in the back that needs to be sealed or the overflow just pulls from behind it.

Purchased this unit almost 2 years ago. Only problem I have had is with baby snails getting caught in the propeller. Keeps my water level stable. Great for my rimmed tank. Love the magnetic attachments.

Been using for a few months now and there's a few things I can say about it. First off, it will back siphon so don't push the hose too far down into the overflow. Second I wish I could order replacement media cubes but so far haven't found any. Don't expect to put much inside if anything. Other than that, it works very well for surface skimming, has great flow and is very slim and hard to see on a black background. I do recommend for someone like me with a small (20g) tank that's not plumbed.

I love everything about this product, except the pump that runs the box, its always on and is very loud "rattling sound". I thought maybe I installed it wrong but after a few minutes of troubleshooting I found that even the pump just free floating in the water makes the same sound. Can't say if they all sound like this but mine does and I keep the aquarium in my office and it is very distracting and noticeable.

I purchased this is March of 2021 and the thing has already stopped working. The sensor is not registering when the water level drops and not triggering the ato pump. For the price of this item you'd expect more then a years service, especially in a fresh water environment.

Set it and forget it... I haven't fiddled with my salinity in ages! I check it occasionally and it's always spot on :)

Product stop working within a 6 month period. I thought it was the pump so I ordered another pump and still getting the same results. Not working. Definitely would not recommend.