so hermit crabs burry themselves to molt due to humidity based on some brief research. i was thinking of making a mudskipper/red leg hermit crab paludarium with complex root structures above water and a shallow/deep end with either sand rock or mud or a combination. but there wouldnt be a land area with coconut husk or something to dig in would this be okay? more likely than not this would be closer to marine to accommodate the crab. basically the question comes down to if they can fully submerge themselves in water do they still need an area they can burry themselves in?