Jade -
I use a coconut based substrate (T-Rex Jungle Bed Premium Blend Forest Substrate) and after a good couple of spray downs with treated water, it really seems to hold the moisture well. Plus, I have read and heard that it's a good substrate for our messy eaters (in that, if they accidentally swallow some of the coconut, it is non-toxic and small enough in that particular blend that they will not choke). My only advice is to make sure that one or two times a week, you mix the substrate (just break it up and move it around) so that moisture doesn't collect in one area and potentially cause molding.
The other thing I did to help with humidity before we installed the water side of the tank was put a plastic covering (just a very thin plexi-glass sheet we had) on top of about 1/3 to 1/2 of the wire screen. That helped keep some of the moisture in while still providing good ventilation, but it really depends on the type of tank that you have.
Hope that helps!





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