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cpeckford, do note he said this is only with special care. However, that is not my main point because even with special care you can't keep one oscar in 15 gallons of water. In a fifteen gallon tank, the oscar may not even have enough room to turn around, while in a 120 gallon tank this is different. I don't really have a good way of explaining it, (hopefully dinger454 or someone else will) but the amount of gallons per oscar can be reduced after the tank is so big. Hope that helps, Art.