i agree size of the tank and oscar makes a difference. however nothing written in stone. ive seen bigger o's get clobberred and vice versa. keep an eye on them when you put them in for a few days. if it was me id put him in a 55 till he got to be 5" then let him go in w the big boys.
I agree that it does depend on personalities of the fish involved as well, but at least IME the oscars are usually on the losing side of the confrontation
I agree that it does depend on personalities of the fish involved as well, but at least IME the oscars are usually on the losing side of the confrontation