Pico Auto top off

[epitoke]

My girlfriend recently bought a little 4 gallon cube. She's having trouble keeping the water level stable since you can only add about a cup a day but that's what it needs. Was thinking of buying her an auto top off for it. Any suggestions on what would be a good buy for that kind of setup?

 

[sredzins]

Tunze makes a great system, the 3155 which is about as accurate as they come. But I know they also make one designed for smaller tanks

 

[epitoke]

Thanks sred!