02-27-2009, 08:53 PM
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well, as a general rule of thumb, a single oscar will need a 75/90g footprint on its own. now this doesnt take into account things like filtration/wc ect. so there are margis, but based on size and bioload, youre looking at the oscar alone in the 90g wihtout needing any additional maintenance.
with that said. i have tanks that are WAAAAAAAAAAAAY more overstocked then what youre suggesting, and have been running this way for years. with "overfiltration" (theres really no such thing as too much), and a religious WC schedule, it is possible to keep more fish in the tank. unfortunately, the 90g wont be enough for bala sharks.