07-22-2008, 08:58 PM
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I would feel comfortable with a number of fish to be included with an Oscar, provided the aquarium is much larger, say 220 gallons or more.
In such aquariums you will find that Oscars do well in a community of large lesser aggressive fish, such as Severums, Blood Parrots, Geophagus sp., Raphael Catfish, adult Bala Sharks, Leporinus, or Tinfoil Barbs. This is contrary to popular myth, which is probably due to "my fish is tougher than your fish" syndrome.
As mentioned, it is very difficult to determine compatibility for Oscars in smaller sized aquariums.