the tank i just bought had alot of this in it, i pulled alot of it off but left some, i dont know what it is but the guy said hes had it in there for 4 years or so and that it just started growing and didnt seem to be bothering anything so he left it there. feels like a wet shag carpet if you can think of how that would feel then you know how this feels
i have 5 tangs in my tank and none of them eat it, i have a yellow, a sailfin, powder blue, blue hippo and the yellow eyed cole tang