red oscar

You cant keep 3 oscars in a 90, a 90 has the same foot print as a 75 but is taller which offers no benefit to large territorial fish. IMO a 55 is too small for a full grown adult oscar with a 75 being the minimum size i would consider placing one into, for two you would need a 120.

Oscars arent fussy about water as long as its clean, in dirty water oscars are very prone to hole in the head disease. A 40% water change or two smaller 20% water changes each week is recomended to keep the nitrates down to acceptable levels.
 
CFC is correct and i might just add you need pretty good filters with these guys as well, a canister does the trick and you will need carbon in the filter
 

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