Help!!!!!!!!!!!!!!!!!!!!!!!!!!!

[RuGlu6]

Direct your pumps to the surface to help gas exchange and to stabilize the PH.
Look for dead things behind the rocks if there is something unaccounted for it could be polluting you tank by releasing H2S.
Look if something has been dropped in to the sump or display tank, penny would be worse case scenario, any metal should be removed, you have any kids playing around?
Is your skimmer still running? If not may be there is not enough oxygen. keep skimmer clean and make sure its keeping up ORP levels.