What is it?

[coralhoarder]

I only noticed this because it fluorescesess at night when the polyps on the rock retract. They are red. A very deep red with a light, almost orange area at the top, almost looks like the head of a golf club.. I'm assuming some kind of algae...

 

[Tahoe61]

Red Valonia/aka Red Bubble Algae?

 

[coralhoarder]

It’s not bubbles, they are on stalks

 

[coralhoarder]

I may scrape them off to get a better pic