I just witnessed my tusk suddenly snap and kill a damsel and then proceed to chase my clowns to their "anemone" and my Naso tang into a cave
He has been fine for the month I have had him. Actually my Hippo beats him up a little now and then. Kind of just reminds the tusk that he is boss.
But just now I was watching the tank and suddenly he chased a damsel into some rocks, cornered it and killed it. Didn't eat it or anything, just left it. The chased my clowns to their "anemone" which is actually hairy mushrooms and then chased my Naso into a cave at which point I intervened. He seems to have settled down now but this worries me.
I have heard of Tusks being aggressive before but usually they are quite docile.