My buddy had the same alae I suppose.
They are not as green when compared to real green-hair algae
but rather "dirty-green", with tint of yellowish-brownish... Of course
this subtle color difference is visible only when you have other
green algae close to compare. Silitary they look green too.

He was fighting with them doing mechanical cleaning. They are
soft and they do come off when you brush the rock with a clean
(new) toothbrush in some bucket of water. You need to clean all
rocks at once, to help your cleaning crew keep up with the rest
of algae in crevices, you could not get it from.

I got infested from him one day when I got some polyps from him.
The rock with polyps bloomed with this algae and I did not see
anything eating them quickly enough. I took out the rock, clean it
and put it back. When done, I noticed I left one fuzz on the rock edge.
I planned to take the rock again to clean it, but it got eaten overnight,
so I have a clean rock now. If you let them grow freely you will have
a lot of brushing work... to do not let it happen.

Of course, do not brush in the tank because it will only make things worse.

"~Vicki ~" wrote in message ...
Thanks Richard,
My tank is 20g and all parameters are normal. The algae is not the
blue-green slimy bacteria stuff but an almost powdery green furry
(short) stuff. I had some of it on a piece of live rock but my turbo
snail ate it. I guess he didn't get it all tho.

I guess a better question would have been "What fish can I buy that
would eat it as a supplement to its diet?" If this were a fresh water
tank I would not have a problem picking a fish, but I just don't know
enough about salt water varieties yet.

Vicki