Probably for the 1000th time...is it cyano or dino.

[alain Bouchard]

I know the best way to figure it out is with a microscope, but I dont have one yet...until then, what do you think it is and what would be the best way to fix it? 180 gal display, 50 gal sump with 15 gal refugium/cheato. 55w UV running for 1 month (thought it was dino, but no change since running it). Medium feeding every other day. 2 large tangs, 1 large foxface, 3 ocellaris, 1 mandarin, 1 medium cream angel, 1 chromis and 1 damsel.

 

[Reefer5640]

Looks like cyano. Try chemi-clean. That stuff is awesome

 

[encrustingacro]

Cyano.