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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



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

[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!