Hello. I have a 300l tank that's 12 months old. It has a cherub angel, 3 blue chromis, 2 common clowns, a blackeye goby a hermit crab and 2 peppermint shrimp in it as well as a sea hare. I want to put an anemone in, but want one that is fairly easy to keep and the clowns will like. I would like...