So i'm just restarting my 50 gal, i was hoping to put a oscar in it, i have a biowheel filter ranked at 75 gal.

Could i put an oscar in, and if so - could i put him in with a blue acara? there is a beautiful BA for sale, he is full grown and was hoping to put the two in with maybe one other tank mate.

50 gal tank is way too small for 1 oscar (full grown), thus,
additional tank mate is not advisable. please go to the thread
about tank size so that you can have an ye view of proper tank
sizing before pushing through with an oscar.

a friendly reminder from OFL member.