Sailors Eyeballs????

It's a kind of macro algae. I call it a pest. :D

If you pop one of the bubbles in the water trying to get rid of it, you're spreading the spores and it makes it worse. (Though some people actively cultivate it.)

You can get rid of it by siphoning out water right above it while you pull it off the rock, so the siphon removes any spores. (Or take the rock out, get it off, rinse it good, and put it back.)
 
Good name for it. I recall a couple of times coming back to the ship after a night of liberty my eyes looked just like that.
 
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