Curious, do you have other SPS in the tank and how are they doing? I have experienced extremely low iodine levels in pro salt that would slowly kill sps frags and I couldn't figure out why until an ICP showed iodine at 0. I started dosing iodine and immediately my SPS that were hanging on came back to life and everything, including my LPS, suddenly began to grow again.Don't know what to do after reading through this thread. I have lost all the Acros frags I got from the fraghouse black Friday sale. I don't know what to blame but I was leaning more towards lights. Now I am scratching my head. Unfortunately I still have this pile all from the black Friday sale and all manufactured in Turkey....