This seriatopora bleached due to zero nitrate, high light, and high alkilinity. I lowered the alkilinity to 8 (from 12), increased the nitrates to 5-10ppm (for the last 4 weeks), and moved it lower in the tank. What a difference. The first pic is about 2 months ago, butnt I made the chemistry / placeme changes about 1 month ago.
2 months ago:
Last week:
2 months ago:
Last week: