Have a colony of Green Button Polyps that have Brown Jelly disease. This is only effecting about 12-15 polyps right in the center of the colony. The rest of the colony seems fine, open, feeding, and spreading. I've had this colony for a long time,(6 years at least). I've pulled out the worst of them and basted them to clean them off.
Why would this happen, and not affect the whole colony?
Ammo-0, nitrite-0, nitrate-5, Ca
-bit firstname.lastname@example.org Meq/l, phos-0, Ph- 8.2, temp-78.
I do 7.5% PWC
weekly with various reef salts, run skimmer, with refugium, under 780w of T5, tank is a180g.
What can I do to combat it. Should I just remove the effected polyps? Been like this for about 5 days.