I have 3 good sized peppermint shrimp. I added a cleaner shrimp and a small 6 line wrasse. Also in the nano tank are 2 emerald crabs, diamond goby and maron clown. My cleaner shrimp has seamed to disappear and my wrasse has gone missing as well. I am thinking the peppermint shrimp got to them. What are your thoughts on the disappearence.