I was given a fantail goldfish in a 10gal tank a week ago. When i got him, i cleaned every inch of the tank because the previous owner never did water changes. once the tank was cleaned, i did a 50% wc everyday. Over the weekend i got 3 more tank buddys. One i noticed had clamped fin. He died 5 days later. The other guys are still acting wierd. The original one has some random raised patches of scales and swimming as if scratching himself. Another one has clamped fin and just drifting around slowly. Is this new tank syndrome or something else?