I feed mine very small smooshed pieces of shrimp that I rinse and soak in salt water for a 1/2 hour. If you watch closely when you give it to a tentacle several tentacles will also come in and pull it into its mouth our tube. 1 Rookie mistake I made with feeding shrimp was using a whole small shrimp. It died, Learned the hard way!! I have been very successful with feeding them very small pieces smooshed alittle to help them digest it faster!! Krill is a good choice also! but like any animal a proper diet is vital to health. Anenomes has to be my favorites I currently have 3 and pick up a new one every month. Slow and easy is the key to growing a beautiful reef tank.