Old thread I know, but lots of good info here, I have a feeling my decorator crab is hassling my GSP which has no been closed for 3 days, when it was previously beautifully open for 3 weeks in my tank. All other corals in the tank look splendid.
Just checked alk and phos and No3. All stable. Alk is 8.5, zero No3 and phos at .045.