coral bleaching can it be reversed?

too much lighting and high temps are some of the usual causes of bleaching. Zooxanthallae will replenish naturally when given time, meaning your corals will likely recover given they haven't bleached completely.
 
In my experience, low mag will simply stunt growth. But again, poor parameters in general can always upset SPS.

BTW, I love going to one of my local fish stores a few weeks after they get their ORA shipments in. The owners clearly do not know how to take care of SPS, so they always end up bleaching. I step in and buy them at half price or less. A few weeks in my tank and they look nice a bright again!
 
In my experience, low mag will simply stunt growth. But again, poor parameters in general can always upset SPS.

BTW, I love going to one of my local fish stores a few weeks after they get their ORA shipments in. The owners clearly do not know how to take care of SPS, so they always end up bleaching. I step in and buy them at half price or less. A few weeks in my tank and they look nice a bright again!

+1

I think the LFS here expect a high turnaround and after a few weeks the corals either brown or bleach. 2 for 1 ORAs are my favorite!
 
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