Well...I had 2 young Oscars in a 55 for a few months, albino is about 6-7", and black one is about 5-6". This morning, before they got their normal feeding, I noticed my albino following the smaller black one around in a bullying manner. I watched for a couple of miutes and then the albino just snapped at the black one, luckily missing. I knew that the day would come that i had to return one of them or upgrade, this morning was that day. I can't afford an upgrade at the moment, so i took my albino Oscar back to the LFS today

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My black Oscar is Ok though...only one lil spot where the albino got him. I added some stress coat and he is seeming just fine.
The already missed albino
I'll get a new pic of my black tiger oscar on here tonight when I get back home.
Let this be a lesson to anyone trying to keep Oscars in too small of a space...it has definately been a lesson to me.