That happens with my cleaner too. It molts like almost once a week. I am going to assume that this is a good thing because its growing. but i dont know how much bigger it can get, its already about 4 inches!! BTW, i leave my moltings in the tank because they are completely gone by the end of the next day. Bristle worms, hermits, and even my brittle star fight over it. The moltings are very high in calcium from what i understand. Someone correct me if i am wrong.