One of the things that I am looking at eventually adding to my tank is an ato. I know that usually the ato will deliver top off water to the sump. I do not have a sump with my system so trying to figure out what type of system would work and be my best option. I am thinking it would be best to probably stay away from float valves with it being in the main tank. I am also hoping to find something that will not be too obtrusive.


