Are you using a dome with a CHE for heating? If so, what I do for my 40 gallon breeders is cut a piece of thick cardboard to fit the whole screen top. Then cut a hole on whichever side you want the dome on 1" bigger than the dome. Then cover the whole cardboard in tin foil. Then I use a double folded paper towel that I soak twice a day(once in the evening and once in the morning) that I put on top of their warm hide(I use reptile basic hides) which are flat topped. This keeps humidity 50-60% and once the paper towel dries out, it still will hold high 40s. It also keeps heat in as well. I keep my house around 75F so the air is kind of dry but soaking the paper towels twice a day will keep humidity going day and night with really only a drop the few hours late at night but that still sits around 47% or so. Oh and this is using aspen. I used Eco Earth for 1 year a long time ago and it was more trouble than it was worth for me.
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