Bubble algae? Or just cyano

[tencwhiskey]

 

[fishroomlady]

it's definitely cyano but it may have some bubble in there too - I've only had green bubble so it looks like that only green

 

[rhino56]

looks like just trapped bubbles, just open the cyano a tiny hole and see if a bubble floats out.

 

[saltyfish]

Just looks like cyano and air bubbles to me. I've seen that happen more times than I wish to admit.

 

[Reefing Madness]

Cyano