The large gimpy swimmer boy, is actually swimming more normally. Back end does sink a little, but not as bad. I also added a bubbler, Which distributes heat better while getting them not to be lazy poops ;) He has not flared yet, or bitten anyone, he is one of the gentlest males I've got.
Oh and for those who did not know, one fry decided he wanted to eat a piece of java moss, and it went from his mouth to his gill. We got it out, and it was a tad inflamed, but this fella is lucky I check everyone - even at a 200+ count. He is now jarred and food for him is MONITORED