04-24-2007, 02:38 PM
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I can only speak from my experience with them. I had one for more than 13 years! He or she is gone now. When we brought young fishes of the same species to keep him company he at first sort of jumped at them as if he was trying to attack or push them off his favourite place. After some time he calmed down and this behaviour never repeated itself. Those living in the tank now are young and very friendly with each other and other species in the tank.
I have also heard that they are calm, but I still remember how our old one jumped at the newcomers.