Ralfsia expansa algae

[Myka]

Interesting, thanks for posting ID. How did you go about IDing it? Just picture match or something more scientific?

It looks a lot like an algae that I had in my tank for the first 6-8 months of setting it up. It eventually just went away on its own as nutrients were lowered and the tank matured. I added a Tuxedo Urchin as well who seemed to eat it a bit.