Is this Bubble algae?

Deltec

navada718

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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.

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Brit’s Fish

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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.
 
Deltec

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