I have a 60 cube with an open top (no canopy or glass) and a LED fixture. My house has been running about 68° and my tank 77°. Obviously with the tank temp higher than the ambient temp and having forced hot air heat the tank is going evaporate water more quickly than if they were both ambient temp. Also dry air from the forced hot air heat wicks moisture from where ever it can find it, which is my tank, to hydrate itself. I have to set up my humidifier. I am currently replacing about 3/4 to 1 gallon a day. I'm curious what other folks are replacing?
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