Hi, I have a Humu that is about 31/2-4 inches long. I have had him since he was tiny. He is not aggressive to tank mates except snails and hermit crabs. I have read that as they get older they can get very aggressive. My tank is 120 gallons and there are fish much smaller than him that he has never bothered. Anyone ever have a bad experience with this fish as it got older? I would hate to have to rehome it. Thank you for any advice