i was doing my daily stare at my tank when i saw in the corner of my tank what looks like a small blueleg hermit crab out of its shell dead in the sand...i pocked it and it is def dead...how could this be? all 3 of my crabs are accounted for and my other hermits are larger than this thing...could it have come out of my lr? i also found a dead pod next to it (looked like plankton off sponge bob...sorry i dont know the true name)