fish r like people we all act different glad all is doing well but one day u will need to seperate the butti cause he will what i call snap lol. from my personal experince mine grew up in a 300 gallon tank with lots of tank mates now he is alone in a 75 gallon at 14" after killing half the fish with him im hoping to make a much larger tank one day and put him in a "community" again. as soon as im able i will post pics of mine and good luck with your fish