I have a Jack Dempsey that is about 3 inches, so still young. Weird thing is that he is always hungry. Constantly freaking out in the front of the tank begging to be fed. I feed him all he time and he eats everything fiercly. I've kept fish for many years now and I've never seen eating habits like this. Can fish have worms, or something of the like? He isn't growing but seems to be in perfect health. Water parameters are fine before anyone asks.