i have had them about 1year in a 75gal with a 30gal sump.I have a 350w pc with 65 and 10k my water is good but today my ph seems high. What would bring up my ph?
i don't know for sure but i would run some carbon.
if they are getting crowded with other corals they might be under attack from a nearby colony.
look at what has been changed lately. have you moved anything? adde3d anyhting etc.?