My 30"+ Snowflake was never interested in eating Cleaner shrimps. In fact, the shrimps would sit on its head and even pick inside the eels mouth after feeding. Crabs, crawfish (Yabbies), glass shrimp, prawns and any sand dwelling fish like gobies were eaten. The eel seemed to know the difference. A Lionfish wont appreciate their services and will eat them for sure. We have to be carefull over hear now as Cleaner shrimps average $100 AU or more, -each!