What is this bubbles in refregium???

Saieditc

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What is this bubble

IMG_20190219_093622_108.jpg
 

watdachuck

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That looks to just be air trapped in typical green/brown surface algae from what Bmwm said.

Below that is Grape Caulerpa, was that added on purpose? Guessing this is a refugium, but unless you love that stuff be careful with it. In the right environment it will grow like mad, and can take over with a poor chance of ever eradicating it.
 

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