That is what they love to bring their bubble nest. Firt the female then male finalises the nest.He is just putting a few bubbles in each leaf ??. I don't know if that's what they are supposed to do but the bubble best doesn't look like the ones my Betta was making.
Good pics !These are the best pictures I could take since he doesn't stand still.
Female's work.there were tiny bubble nests scattered around