Temperament wise, its fairly peaceful. Although he's 2nd "top dog", in the tank, he's not a bully at all. He does give the notatus a brief chase every once in a while, but never attacks any of the tank mates. When it was younger, it had a habit, every once in a while, of taking a quick strike at a tank mate, and eating any scales that became dislodged....but like I said, no real aggression. While it likes to eat, its not greed and piggish. Its "guy" has been one of my favorite fish.I absolutely love bocourti man. My pearsei should have been a boc but my son didnt want to wait..... ended up with a maniac pearsei. Hows your boc temperment ?