My mag was extremely low (like 800's) and I raised it a little to fast in a water change batch. I think I raised it up to about 1200 just like that, my bad...
Mainly zoa's and bleached a little bit at the tips. It was really weird, the zoa's skirts got really pale, acans were fine, SPS was fine, but the zoa's really hated it. Finally this week my RPE's have gone back to normal, they had the pale looking, weak looking skirts for about 2 months.