The sixline is a great fish. I love mine. They add nice color and activity to the tank. There are some good flake foods on the market, but just like you do not eat the same thing for dinner every night, you should add variety. Prime Reef flakes by Ocean Nutrition is what I use. You can also offer a wide variety of frozen food. I like San Fransisco Bay Mysis or Marine Cuisine. Be careful not to over feed, thaw and rinse all frozen food in RO
water before adding it to the tank and soak it in suppliments like Selcon, Vita-chem and Garlic.