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[rsisvixen]

I have this nice red grape kelp macro algae and over the last 2 weeks this hair-like stuff has grown on it, its no where else in the tank-just on the algae.

Looks kinda like small anemones or something

http://i1148.photobucket.com/albums/o574/rsisvixen/Saltwater/IMG_20150312_171039.jpg (http://s1148.photobucket.com/user/rsisvixen/media/Saltwater/IMG_20150312_171039.jpg.html)

if you look at the center of the pic you can see what they look like-small tubes with hairs.

http://i1148.photobucket.com/albums/o574/rsisvixen/Saltwater/IMG_20150312_170950.jpg (http://s1148.photobucket.com/user/rsisvixen/media/Saltwater/IMG_20150312_170950.jpg.html)

[matt_C]

digitate hydroids....not good;)

[rsisvixen]

Should I do anything about them or will they just vanish over time?

[Myka]

I'd remove the portions of the algae that are affected. You don't want hydroids in the system!