So today, after about 6 months of reef keeping, I have found out hermit crabs do indeed molt. I have tossed out a hermit crab or two thinking they were dead. And everytime I would do an overall test all my paremeters would come out positive and ok. And I would think my CBS would be killing them off but I just realized they may have most likely been molts. Makes me wonder if I tossed any emerald crabs mid molt as well. Emerald crabs I have no luck in keeping and they are just the one thing I cannot keep for a week.