Air bubbles have nothing to do with the nitrogen cycle, only testing for nitrite and nitrate will show that.
Are you talking about microbubbles in the water?
Tiny bubbles on rocks and surfaces? Some algae and other crap that is part of cycling may give off small air bubbles.
If you are thinking about the part where bacteria break down nitrate into nitrogen gas, that won't be for a long while as that type take the longest to establish themselves (~6 months+). And I don't think it would ever be at a degree that you can see air bubble.
If you have bubbles on your rocks it's probably diatoms or an algae bloom. Totally normal. Once you read 0 ammonia and 0 nitrite, do a water change and add a clean up crew. Cerith and dwarf cerith said will eat some of the stuff.
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