HCA: Hermit Crab Association

So my tank is a 20 gal with a glass folding lid Im using two of the flat heaters you get from the pet stroe that stick straight onto the glass. My readings on the gauges are 80 % humidity and 70% heat but the heat struggles to stay at that temp even Like having I am planning to change the sand to co...

So im having a problem keeping it wark in my crab tank. It doesnt matter what size my pools of water are its always more humid and too much moisture that the heat isnt staying. I have two tank heaters attached to the side and my crabs are always huddled around them because i cant get the rest of the...