ok so one of my tiny E hermit crabs has been acting really strange lately. for the past couple of days he has compleltly submerged himself in the saltwater dish for a good 20 - 30 minutes at a time without coming back up, sometimes longer than that. After his dip, he come back up with his legs still in the salt water rests for a while, then goes back underwater for another 30 minutes or so. it is so weird because i didnt think hermit crabs could stay underwater that long???? anyways im thinking he may be collecting water for a molt but i just found this activity really weird and thought i would ask you all. humidity in the tank is around 80% give or take a couple percent.