Strange Bubbles

sen5241b

Reef enthusiast
What are these bubbles? I blasted them off with a turkey baster and they come back in 20 minutes. There were no bubbles when I first put them in the tank 6 or 7 weeks ago. Don't bacteria convert nitrates to nitrogen gas? I do not see any trace of bubble algae or cyano in this LR. The rock pieces you see in the pic are highly porous and calcareous white coral I found on the beach and cured myself. The other LR in my tank has few if any bubbles like these .

LR-bubbles-0003_1024x768.jpg


LR-bubbles-0003_1024x768.jpg
 
That somewhat small rock could not seep air out that much for 6 weeks. Its been oozing bubbles for about a month but there are no signs of algae.
 
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