I added 3 strawberry barbs and 2 green tiger barbs and added 1 decoration. They seem to be readjusting the hierarchy and seem to have found one to pick on. He has been keeping to himself and has been swimming at 45 degrees as a sign of submission. Today I've noticed that is pelvic fins are missing. Im going to quarantine him but will I ever be able to re introduce him to the tank ?? See the attached pictures....