I have a guineafowl puffer that has been in my tank for about a year. He's housed with a 3" clown trigger and a 4" powder blue tang. The tank is 125 gallons. I usually feed the fish once a day and vary the meal from clams to krill to other shrimp (I alternate one of the three). I would supplement that 3-4 times a week with marine algae (seaweed selects). The puffer is really overweight and I decided to cut back on the amount that I was feeding the fish. Now, the puffer has become aggressive and is often chasing after the trigger trying to eat him. He chases and lunges with his mouth open. I've seen the rear fins on the trigger a little shorter lately and it's becoming more frequent now. It was just happening when I fed them, now it is at random. Before I cut down his meals, they all lived in harmony and I had no problems. I am most worried about the puffer getting too fat (he looks like a baseball with eyes and fins), water quality and the trigger becoming a meal someday. Any suggestions?