The foods you feed your tank are very important. I only feed foods of aquatic and primarily marine origin. I do not feed things like Romaine Lettuce to my tanks.

I often feed a variety of dried algae such as Red & Green Nori, Spirulina Flakes and many brands of frozen foods. However, buying frozen foods and paying LFS prices is just to expensive. I now make my own frozen food mixes and I'm having much better results. Fish and corals look vibrate and eat with gusto.