11-06-2009, 02:25 AM
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The problem with keeping two Oscars aside from the heavy bioload, is that these fish while small, may get along well. It is when the fish become more mature that one or the other will assert itself as the dominant fish and if tank size is not large enough for both to claim an area ,then frequent squabbling up to and including serious damage ,is likely.
In my view a 75 gal tank would be the minimum for one Oscar and the filter should turn over, six to eight times the volume of water in the tank each hour.75x6 =450 gal per hour.IMHO