yeah - the humidity is around that (varies a little but sits around there) they get misted twice a day as well. So I am pretty sure they have enough humidity. They only really get onto the substrate at night time when they are hunting, the rest of the time they are sitting up in the cage much higher resting. I am glad to hear it won't hurt them as that was my main concern - I guess it will just be a constant cleaning routine to keep the water full and minus the sediment and spot cleaning of the glass