Anubias leaves letting out bubbles.

i agree^^^ i have had that happen after cutting some of my hornwort!!!
 
Is there a specific reason only one leaf on one plant is doing this? I have three Anubias Nana's on a piec of driftwood. one at the bottom, middle and top. The middle one is the oxygen maker. Could it be that the C02 output is close to it??

Nope, it's pretty much random. The same thing happens to me, it only comes out of a couple leaves.
 
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