have a 6 ft long 125 gal, but I can only keep it for two years before going off to college. I have a family member who keeps big fish and he will take them from me when I go to college. So I want to stock it with big fish as I will only have it for two years. I'm gonna have a sun sun hw304-b canister which is 525 gph and a marine land emperor 400. What should I keep? By big I mean oscar fish size or bigger like clown knives lol I want to buy them as juvies