What is this on my candy cane coral?!

[brettory]

I saw these dark “bubbles” show up. I tried blowing them off with a turkey baster and they wouldn’t budge. Tried nudging them and they’re somewhat firm (didn’t pop). Tank is 4 months old; have been working to get dinos under control. Is this related? Any idea?? Pic attached!

 

[Propane]

Bubble algae I think.

 

[Cell]

Valonia/bubble algae. You should be able to just pop them off with a gentle nudge from near the bottom.