SPS Coral Dieing Slowly

[Stigigemla]

I would go with GFO. Just use the recommended dose in a sock. Agitate the sock every second day so it doesnt clump together.
Exchange after 2 weeks. And measure Your phosphate level. Dont go under 0,05 becauase corals need a little phosphate and dont like it if the level is sinking to fast.

 

[xjiang7]

GFO mixed with active carbon should do the trick.

 

[Cory]

Imo low potassium has caused paled corals. What im seeing here is low potassium, calcium and magnesium. If the icp is correct its not surprising they are dying. High po4 wont kill coral ime. It will darken them, and make them not calcify as quickly but wont kill them.