This looks bad real bad

[Peter Dietz]

What is This? The purple coloration is what I'm referring to

 

[Peter Dietz]

It's spreading real quick

 

[saltyfilmfolks]

I'm assuming its cyano on a dead coral.

 

[GobyWanKenobie]

Does it syphon off? If so, it's cyano.

 

[MillerR.]

Just looks bleached to me maybe its coloring up, but my vision sucks! Turkey baste it to see if it blows off.

 

[Waters]

Defiantly cyano.