HCA: Hermit Crab Association

He is in a 20 gallon aquarium and right now he is in gravel. A little sand. He is all by him self. I know I need to change his environment. But can't do anything till Friday. His cage temp is reading between 76/78. He is still very active though without a shell. I have pics but idk how to post them ...

My daughter won a hermit crab from school last week. I have no idea what type, gender, or anything else for that matter about it. Everything seemed fine with the crab very active and then all of a sudden tonight it had came out of its shell and had not went back in. I have quite a few shells in ther...