is this algae, bacteria, something bad, what is it???


New Member
hi guys.
recently these bluish hairs have been hanging from and on and through my big batch of halimeda macro. I've read about Halimeda creating spores that can cause problems in the tank, but so far this hairy stuff is just on the macroalgae. I don't know if this is something related to the Halimeda or if it's something else altogether (bacteria (i do have a lot of forams, both the hard red and the branchy white) or algae, etc).

Any thoughts? I've searched the I.D. sights I know of and some of the posts here and can't find anything. It's whitish/blue, not really sticky, but sort of coarse and, well, hairy. It plays in the current, doesn't break easily. Thanks!