Coral Bleaching

[Sam Samy]

Has anyone ever had corals bleach on them. I've been reading about bleaching and recovery of corals, and what might cause them to do so. Its seems everything points to temperature and salinity.
Well, I have 2 acros bleaching on me at this moment. I've checked the temp (75-80C) and salinity at 1.023, PH 8.01 - 8.28, Nitrite 0, Nitrate 0, Ammonia 0, Phospate 0, calcium 440, Akalinity 6.6dKH.

Any ideas as to why this is happening????