Sorry I didn't reply to your message; dealing with health issues. Anyway, this used to the tank bully which may have its own stress. Now he shies away from most others. The wound healed but another growth appeared a week or so ago. And now he's slowing down. Feeding is comprised of Cichlid gold pellets, Cobalt flakes (maybe a little old now), lettuce and occasional frozen food.
Thanks Becca.