My shark used to come up and eat with the other fish, but ever since I added new fish ( over a year ago ) he never does. I try to put food out near his little territory but one of the fish always goes through and eats it out of the gravel so I'm not sure if hes even getting enough. Hes not thin or anything and I've been putting algae flakes out for him the past week or two. I just wonder why all the sudden he stopped coming out to eat? The fish that are in there right now are not aggressive towards him, hes the aggressive one in the tank actually. I know hes obviously eating or he would be dead I just wanted to know if there's something I could do to fix it.