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They are not related to those fish at all, different species and families. Oscars are not really agressive fish, but will eat anything they can fit into there mouths. Most fights come from territory disputes, and if fish are breeding, you will get more aggresion out of the pair defending the spawning site or fry. Hope that helps!
 

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Sexual Mature Oscars are REALLY agressive against other Oscars.

Always varies from fish to fish, but Oscars can be quite nasty.
 

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I agree with Pep Oscars are Really Aggressive! Especially when they get older. They really want a tank to themselves. A 75 gallon is great for a single Oscar. I have mine in a bare, very bare 60 gallon all by himself.
 
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