do you only feed flaks and pellets? I feed frozen every day and use some garlic on the food. SOme maybe against it but I find it to work. I feed flakes occasionally.
Mix in the pellets and flakes with the frozen ....works for all my finicky eaters...some had success with not feeding for a few days, but I don?t recommend that method especially with tangs because they are very active and need daily nutrition to stay healthy....