wow that is incredibly overstocked and cruel 2 oscars that size need at least 125 gallons.. pacus will get huge and will need at least 250+ gallons....fishkeeper4244;4826413;4826413 said:i have had two oscars (8in), a pacu (8in), a goldfish (5in),and 2 bluegill (5in) all in a 55 for about 2-3 months.