Coral Disease?

[MasonJar13]

this coral has been very irritated and is turning white and dying in one area. The polyps have been closed mainly. Has anyone seen anything like this? All other corals and fish are fine!

 

[T-J]

We'll need more details: Age of tank, lights, NO3, PO4, Alk, Calc, flow, etc.
Also, are those clove polyps or something else?

 

[Ocelaris]

Check this out

Tulip-polyp syndrome and neoplasia

So, I have a question for everyone keeping SPS, and Acros in particular... For around 2 years now I've been having issues with most acros in my 177L frag tank. This problem also occurred in a previous 10g system frag system, from which these corals were transferred, but NOT in my separate 200L...

www.reef2reef.com

Looks similar. Mine was probably from high nutrients after overdosing carbon for a while. Things have settled down now after regular good husbandry