ok i have been noticing my sps coral starting to turn white and no polyp exention for a few days now i dont think it is rtn, becuase it is has got more white over time. can you guys help me i need to know what is going on. all my other sps are doing fine. i thought it was bleaching so i moved it down and it seems to be doing worse.
here are some pics of the coral.
here are some pics of the coral.