Is this Bubble algae?

[navada718]

I recently (2 week's ago) placed a H.O.B refugium on my 50 gal AIO tank. This morning I noticed these clear bubbles in it. What is it? Best way to get rid of it?
Course to prevent it in the future?

Noteworthy mentions:
•Phosphates : 0.21

•Nitrate: 0.16

• Tank has been cycled since December

• Refugium light (Innovative marine light) is on for 11 hours a day

• I ignorantly turned the pump for the Refugium off, for the 1st week & a half when setting up the refugium, during the day when the refugium light was off. I since keep the pump on 24 hour's.

 

[Jekyl]

Look like air bubbles to me. Bubble algae is greenish black

 

[navada718]

Look like air bubbles to me. Bubble algae is greenish black

So I don't need Emerald crabs for now, thanks.

 

[Brit’s Fish]

Definitely air bubbles… maybe some gasses escaping from sand/rocks. Bubble algae looks like little dark green pearls. You can probably just stir the bottom a little to let the air bubbles rise on their own.