Of course one leads the other. I have a King Angelfish in a FOWLR tank. I've had this fish since it was small, about 4 years. He's growing like a weed and is a big fat fish now. The fish is healthy except he has head and lateral line erosion (HLLE) on his head only. My problem is he only will eat one kind of food: Formula Two pellets. I offer brine shrimp, frozen Angel formula, seaweed selects, even broccoli, but he turns up his nose. He will wait for the Formula Two pellets. Sometimes he will wait all day and just watch the other fish gobble up the expensive foods I buy for him. This guy is spoiled rotten. Anyone have a similar experience? Any tricks to getting a fish to eat new foods?