Massive blue clove die off

Jyetman

Active member
I know that most people say blue cloves are the devils spawn coral but I like them. I've had them for couple years and recently started to become problem but couple of days ago half of them just died off practically over night. My nitrate, ph, phos, ammonia and dkh all test normal. My tank water is kept at 79 to 80 and salinity at 1024.5 no major fluctuations. Not sure what has happened but all LPS are doing fine? One group of pallys looks sick and 1/2 of my cabbage coral shrank all others look fine. Only thing I've done before cloves died was four to five weekly water changes about 15 to 20 percent. Because of my algae scrubber I normally do a 25 percent water change every three months. Please advise?
 
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