For Shrimps, Molting is an important stage of lifecycle. During and after molting, they need a safe and quite place since their new skin is relatively soft and need time to harden. If they do not get perfect place, they become stuck in their old shell & perish. Not to worry, just install Ceramic Shelters in your shrimp tank and watch perfectly healthy growing shrimps.(Clean the product in cold water for removing dirt before putting it into your aquarium.)