Help ! Flame Angel Not Well

[kien]

Have you added anything else recently? What you describe sounds like Marine Velvet. I would take out the flame and hospitalize him so you can observe and treat. Also keep an eye out on the other fish as what he has is probably very contagious. If it is Marine Velvet (I hope it isn't!!), it can wipe out your whole tank if not treated soon.. like right now!