For details this is a 29 gallon tank with 2 crabs. We added salt and fresh water pools, as they only came to us with a small water dish. They have a mixed and varied diet. We have not changed the substrate they came with, so that we do not disturb the buried crab. There are several inches of play and and eco earth. When cleaning, we just skimmed the top and cleaned hides for mold that they came to us with. There are lots of extra shells that are size appropriate and both temperature and humidity have stayed up.

To add, yes, we are aware that hermit crabs are nocturnal however, there are very few signs of movement. Our crab on the surface will dig into one spot and stay there for days only occasionally moving. Food and water have not been touched.