ID: Dark Brown Algae

[reefwithareefer]

Originally Posted by Vancity

Yes Mindy I can see "very very very" fine filiments on the surface, it feels and looks like velvet and is maybe 1mm deep. The base is very thin and encrusts like coralline. It does look like something an urchin would take care of but its a frag tank so that's outta the question

Had a look at some photos of wafer algae (Lobophora) as you suggested Brad but don't see anything about it that looks like it's going to fan out/upwards like that, unless there's a strictly encrusting type.

Mindy, thought I may have the same thing. I looked it up and there are a few variations,one of them being an encrusting/matted variation. I may have the branching type

Just my 3 cents worth...