Severum bullying

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I believe cichlids (including oscars and severums) need at least a minimum of 10 gallons per inch of adult fish to keep aggression down. Aggression is all about too big a fish in, in essence, what is a puddle.
So as and example 3 ten inch severums, need at least 100 gallons.
Oscars will reach 14-15" as adults. A pair need minimum 150 gal tank.
Anything less and you are bound to have unchecked aggression.
 
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Your issue with aggression is cause by the small space they are confined in. A 75g is barely doable for a single oscar only. You'd have a tough time keeping one alive in that. A 20g for all of those fish is crazy even at their current size. Unless you do extreme water changes they will not live long.
 
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Yes, if you bought a pair, its asking for trouble, esp if m/f. Return 1 of the oscar or rehome. Also had trouble with severum ( I had 4). I bought driftwood with lots of branches. Peace at last.
 
65g is too small for an Oscar considering they can get absolutely HUGE. I'd say you're pushing your luck with just a single pair of Severums.

Might I interest you in another species? A group of 4 Festivums OR 5-6 Keyhole Cichlids OR 5-6 Angelfish would work in 65g and they kind of have that Severum look and behaviour.
 
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