Bubbles in sandbead?

Crested

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Hey all, my tank is a few months old now and I'm starting to see bubbles in my sandbed. From what I've seen they're just nitrogen bubbles completing the cycle but my sandbed is only 1-2 inches. I've also seen people say that it's linked with cyanobacteria but I don't have any, just the general uglies that come with a new tank. Anyone know what they are?
 

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