Midnight

Wow, very strange, never seen anything like that... looks like a strawberry, doesn't it? Google around and there is a strawberry sponge in the ocean, but, I'm not sure if what you have lookips like it: http://www.geofishdive.com/images/mo...%20Dive_lg.jpg

its a strawberry tunic I believe harmless filter feeder nice find

I have a feeling you are looking at a red valonia. It's a pest algae. Some will be polka-dotted, others just a reddish orb. Got any more to take pictures of?

I agree with Marc. Red valonia is more often irregular in shape when compared to green bubble algae. It's also considerably more slimy when popped open. I'd remove them, preferably outside the tank if possible.

Definitely Red Valonia. Some glow pretty under actinic lighting, however like Marc says "a pest algae" which eventually overgrows and crowds desireable specimens.