aggression.

I have 2 beautiful Oscar fish, and im curious about their behavior. I'm wondering if it's the males who vibrate and is it the females who clear away the tank media for a nesting place? Or is it the other way around? Or maybe both?

I've had a blood parrot cichlid named Sissypants for 8 years. About 5 years I got another BP named Igor. They are now a mated pair (although not fertile). However Igor is a dick. He grew huge and ugly and is a complete bully in my tank. He bullies the other BP and my giant Polyepterus...