What are the reasons for a SPS to bleach and lose tissue

[krazekajin]

by the way, one thing that I forgot to mention. The digitata that is doing so great is an ORA frag. I don't know if this helps it being a captive grown frag, but so far so good.
Anybody know exactly what ORA is. I know that it is a captive grown (research?) facility . . . I think.

 

[krazekajin]

Just an update. After a few days of very fast bleaching, my acropora tenus has stopped bleaching. I am not for sure what has helped it. The only thing that I did was take out all of my media in my canister filter except carbon. Perhaps this boosted the flow and that was all that was needed.