nope havent add any chemicals other than prime. Well good news is he made it miracously BUT the bad news is that he has a bent spine now starting right behind the gill plate. hes not swimming very well and i checked on him today and he got beat up. I might just cull him.
Same thing happen to me. If you can prevent him from getting picked on ill bet he'll get slowly better and then plateau. If he's eating he'll make it. Mine swims with his front fins, has beautiful colors and gets along with everyone else.