Well, what a dumb thing I did.....I bought 1 Oscar, 2 EBJD and a blue acara all at the same time. Stupid. For one thing, I didn't know anything about the blue acara till I saw him at the pet store. The person working there said it would go just fine with Oscars, but now I see that my Oscar is already showing aggression towards the acara. I researched it over the internet and in most cases....Oscars and acaras don't mix. All these fish are babies. The Oscar is about 3.5 "....acara about 3", and EBJD's are about 2". The main reason I think I messed things up is....I should've bought my Oscar LAST. They grow so fast.....he will quickly get big as my other fish grow slowly...which isn't good. I really love all my fish....but I think I should take the acara and the Oscar back. And then get an Oscar LATER. Do u guys agree? They are in a 75 atm, but I'm buying a 125 next week.