ID: Dark Brown Algae

[Myka]

Yes, Lobophora has an encrusting type too. The main difference is the filaments are only on the outside edges of the Lobophora and Pseudolithoderma has the filaments all over. The filaments should be more like 3-5 mm long, and very, very fine. These are feeding filaments though, so the algae have the ability to retract the filaments. As mentioned above, when looking for pics of Pseudolithoderma, look up Ralfsia instead as you'll find many more pics.

If it is Lobophora, I would be trying to remove it. If it is Pseudolithoderma (Ralfsia), I wouldn't bother messing with it.

[GoFish]

So it's not the Lobo type then as there are filaments on the entire surface, not 3-5mm but it could just be young and not there yet... Searching again for the Ralfsia I'm finding more photos that look identical to what I have. Thanks for reiterating that, searching for Latin names can be a chore when I see scientific articles everywhere in 50% latin

Thanks again Mindy