My LARGE hermit crab was found one morning on top of his shell dead. He was covered in a clear whispy slime that within a small amount of time became thicker and appeared similar to a cob web that was blanketed over the entire crab. The rest of the tank kinda stayed on the other side until I took it out (which stunk really bad) Does the dead crab release any kind of toxin or anything that I should be worried about? And what about the shell? Do I take that out too?