Has he been like this since he arrived?
Was he placed in a holding tank prior to introduction to the community tank? If at all possible, remove him into a quarantine tank so as to reduce stress on the fish.
Sounds like he cannot maintain his equilibrium. When he swims, does he swim nose down? It's possible that it may be a swim bladder issue, especially depending on the sedative used on the fish prior to shipping. Due to the sedative and the lack of o2 when he arrived, this could be a side effect. -If it is, it should clear up within a few days. If you want, you can treat with melafix and salt and keep the tank dark.
Was he placed in a holding tank prior to introduction to the community tank? If at all possible, remove him into a quarantine tank so as to reduce stress on the fish.
Sounds like he cannot maintain his equilibrium. When he swims, does he swim nose down? It's possible that it may be a swim bladder issue, especially depending on the sedative used on the fish prior to shipping. Due to the sedative and the lack of o2 when he arrived, this could be a side effect. -If it is, it should clear up within a few days. If you want, you can treat with melafix and salt and keep the tank dark.