I would like to setup an ATO system for my nano. I have a Tsunami, but I think it may allow for too much variance before switching on/off. What would everyone recommend for ATO on a 12 gallon nano?
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I use a JBJ ATO. I haven't measure it, but it is pretty sensitive and does a good job maintaining the water level.
The sensors fit on a hanger so you don't have to worry about suction cups.