I can tell you NC2WA that I don't want it in my tank! Its pretty but invasive. It climbs all around the bases of my acro's and could smother them if I didn't prune it. It would be great if it was under control.
Boomer! Thank very much for pinning it down to Jania sp. In reviewing more pictures of jania I agree with your conclusion. I just don't know why or how it showed up. Could it have anything to do with the fact that I changed salts? It seemed to appear soon after I switched from Tropic Marin to DD Pro.
My tank (like everyone's I suppose) has evoloved since inception over 2 years ago and had various algae blooms and booms. First it was the hair algae, then I had some huge beautiful scroll alage , then red turf algae and now jania. The previous algaes have all gone away, Do you think the jania might go away on its own after some time?
Anyway, its nice to know roughly what it is.
Thanks again.
Jill