Nate, try Melafix. I suggest removing your activated carbon, only dosing every other day rather than every day, and run your skimmer 24x7. And be ready to replace a lot of water from your skimmer! Then do a 25% water change after 5-7 days.
Be careful though, it can hurt some corals and your grammarus and mysis and copepod populations!
Good luck!