after the lights come on. The ol' chloroplasts are working, photosynthesis is humming and so much oxygen is being produced that bubbles are forming on the plant extremities.
That is called pearling, as a pearl is being formed. In the case of Valesnaria there can be a stream of bubbles rising from the plants.
That is good news for your fish. Your plants are having their needs met too.
As that process goes on the pH of the tank should go up. The carbon dioxide in the water, which has formed carbonic acid, is being taken up. Less carbonic acid in the solution will cause the pH to rise.
If someone who is really into testing and who has a pretty good batch of plants in a tank would like to, please measure the pH at dawn, in the middle of the day and about 5 PM. I'm sure measurements would be different for most of our aquariums, but there should be a pattern. It would be fun to know what is happening. (Only a fish-head would say that!)
The differences in pH are just one example of how different tanks have different chemistries.
So remember: pearling plants are "happy plants. <G>
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