Trying to identify type of algae

[peggy]

I have a white "algae" growing that I can't find any reference to in my books. It's on the tip of a rock that has a a protuding edge to it. It resembles white stands of cotton with little pieces that wave in the water.
So far it hasn't spread to any other area and is very slow growning. I've already tried taking the rock out and scubbing out just that area but is came back. Does anyone know what it is? And if it is bad how do I get rid of it?
:help:

 

[bigarn]

Do a search on Q-tip sponge and see if it looks the same.

 

[peggy]

Well I can certainly see why it's called Q-tip but mine looks more like spider webs all woven together.

 

[bigarn]

Originally posted by peggy
Well I can certainly see why it's called Q-tip but mine looks more like spider webs all woven together.
spaghetti worms?

 

[birdy]

Most sponges are harmless, but most do not grow in the light, most grow under rocks so I am not sure what type you have growing. I wouldn't worry about it too much. The only truly bad sponges I know of are the type that bore in the skeletons of hard corals, and that is not the type you have.