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It's well-known that Carbon is usually the element that's most lacking in aquariums..

When you do a waterchange (or add carbon dioxide, or use soil substrates), you add carbon dioxide. The plants have a huge burst to photosynthesis, absorb the dissolved CO2, and release O2 gas (oxygen. Remember this from school? ;)). The bubbles you see coming from leaves are O2.

If it's coming from the substrate (I can't see the movie), then it could be rotting. Could be CO2. No real way to know...
 

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yes bubbling is normal. the king of bubbling thats going on in that video appears to be a a damaged leaf of the corkscrew val. Oxygen is released from the damaged area. I noticed then happens alot during a water change, especially when the waer is warmer.
 

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I thin Blaxicanlatino is right, pearling in my experience usually results in lots of bubbles stuck on the leaves, this looks like one point on the plant thats releasing bubbles while the rest are not.
 
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