i also has one 3" yellow african and one jewel + 2 black convicts with the butt and texas. the texas is boss, he is more than twice as big as the butt. i also have a 6' bala shark. it has been two months and no casualties. The times it did not work out is when I put in a 6" midas, it got beat up by the butt. the other time I put in a 12" oscar the texas kept harrasing him so I ended up geting both out. I am rehoming texas so there will be only the 18" arro with the 10" butt and those small guys.