Even in my 90 gallon The one I have (I know, I had more, bu I have lost a few...) It seams quite content to eat scraps that my other fish can't find. It is healthy looking and not missing any scales. Maybe 4"? I have had larger fish, bu they NEVER missed meals.
I just made a move of a few fish and this bala went to a different 90 with active scoolers. It schooled with these fish before and I'm sure it'll feel safer too.