Mine ignored all the other fish. they only act aggressively to other dats and fish that are bite sized. They are extremely slow growers and can be hard to get onto non live food. Mine only grew 2 inches in 4 months got ich and died. Seem to be a pretty weak fish in that respect but until he got ich he was perfectly fine and healthy, only problem is I couldn't get him onto pellets I tried everything so he had a diet of live only and to be honest I wish I had never bothered getting him. I should've waited to pick up a bigger one that was pellet trained for a bit more.