soft

Hey all, Kinda new to the hobby...If i'm doing something completely wrong please tell me:D So I'm looking for a good LED light for my 20 gallon long tank (12 x 12 x 30) with mostly low-light soft or LPS corals. The coral that would require the most light would be a toadstool leather coral...

What are these? They are all over the wall of my sump in the return section. The pic outside the sump is one I took out. They are soft and don't appear to be moving.