I always got my fish as juvies and grew them out. I have a 180 that is like that now, but I also have a 3.5 inch Convict in a 30 gallon. So I was thinking on getting a pretty big Oscar if I can find one (6-8inches), add the silver dollars, let them acclimate. Then after a few weeks add the convict, and another juvie, (either a FM, Jack D, or Blood Parrot). Not sure yet. To me that makes sense. What do you think? Thanks By the way, I dont really believe in the whole hybrid thing, but a BP might work in this situation.