Yeah, I'm afraid that your tank is nowhere near big enough for the Oscars you've got. I wish you could come to my place and see my Oscars, I think you would be pretty shocked at how big they are. Do yourself and your fish a big favour and take all but one of your fish back to where you got them, or get yourself a new aquarium, a much bigger one.
God, I hate situations like this, there's nothing worse than telling someone that they will need to re-home their fish. However, what's the point of us running a support forum if we are not going to be honest with people?
I hope you don't hate us now?