I have had this trigger for at least a year, he is gorgeous but I have had to move him from tank to tank as he is very aggressive. I just removed him from a 90 gallon tank with a porcupine puffer, a niger trigger and a rectangular trigger and he was in there for a week and he was fine, then this afternoon he went after the puffer. So I moved him to a quarentine tank I have. He is about 4 inches long maybe a bit bigger. He is kind of destructive too, tearing items off the side of the tank and moving rocks and shells. I would appreciate any help.