Mysis...I'm not a fan of silversides and have mentioned so in many threads. Bony fish have the chance of bones sticking/choking the anem and I have seen from many other people's posts that their anem poops up skelatons. My anems never expell waste that I have seen(over two years) and use all the food given to them. My shrimp tries to take it when I am feeding, so I squirt a few mysis in his direction and he takes off. He never goes inside my anem to eat out of it, he never harms my anem, he never steals food after the initial feeding, and my anem never spits up waste like many silverside feeders' anems do.
Any inverts with thin chitonous shells or any where the shell can be removed should do fine. I get whatever SW inverts are up at the store(Everything in my tank especially likes squid and scallops), freeze it, grate it with a cheese grater, add selcon and garlic, and repeat the first two steps as necessary.