When Tusks Attack!

[Lance]

So far mine has been a model citizen. (fingers crossed) He too is an Aussie but came in on a later shipment from yours. He's been in the tank for a little over a week. I read a good article on these fish by Robert Fenner, who considers them mostly a good community fish. They tend to leave other fish alone and fish leave them alone. Trouble seems to come from live-food feedings, which can bring out the aggression in them. Have you fed it any live foods.
I hope yours calms down. Good Luck.