03-02-2008, 02:05 AM
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Sorry to disagree, but I have a 90 gallon tank, I also have an oscar... and there isn't room in there for more than maybe one other smallish fish. My oscar is almost 12 yrs old now, full grown at about 14 inches. When he was with the other oscar they were in 225 gallons and that was just big enough for the 2 of them. Oscars are cichlids, and are still territorial. A 14 - 15 inch fish needs space to claim as his own away from the other fish. With a jack dempsey who's on its way to 8 - 10 inches... that right there puts a 90 gallon tank at its limits. That geophagus will get to almost 12 inches. Stand in front of a 90 gallon and count it out, 14 inches for the oscar, 8 - 10 for the dempsey, 12 for the geophagus, and a green terror at 8 inches... where would they all go?? Those fish, at full grown (which they do quickly) would never even fit into a 90 together. Add aggression levels and the territorial habits of cichlids, and how fast they grow... I'm sorry, but there is no way I can say that those fish together in a 90 is ok.
The sores sound like a possible bacterial infection, I need to do some checking first to make sure it isn't parasitic... and before I can suggest any medications to help it. I apologize for missing the nitrite and nitrate levels in the original post. Can I ask what kind of test kits you're using?