06-09-2008, 03:15 AM
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In order to answer your questions, we'll need to know more about your situation.
How big is the tank?
How big is each fish?
How much decoration is in the tank?
Is this normal? Sometimes. It will depend greatly on your answers to the above questions. A mature oscar defending it's territory can be quite fierce. If it is feeling crowded, or if the decor hasn't been rearranged when adding the new fish, then all you are doing is adding an intruder who also needs territory. Thus, the fighting you are witnessing. IF the tank is large enough, rearranging the decorations can usually resolve the problem, but that means ALL decorations in the tank. The idea is to take away anyone's territory that is already claimed, so empty everything out and put it all back in but differently. Give them both the opportunity to find territory away from each other at the same time.
Sometimes something like this requires adding more decor to the tank, and/or getting them into a larger tank. These are fish that grow very large (about 14 - 16 inches each) and then do so rapidly. They need a lot of space. For 2 adult oscars, they should have at least 150 - 200+ gallons of water to manage their waste levels and need for territory.