Hammer coral disappearing help!

[Trabby]

We had a "peppermint shrimp" who was actually a camel shrimp. He ate and maintained aptaisia.. Ate with the fish daily. Then we noticed one day that our hammer coral was looking weird... Something was eating it.I moved it too late..We eventually caught him red hand handed eating the mouth of our plate coral..he left the tank shortly after. What type of shimp if any do you have in your tank?