It sounds like your plants are pearling. Probably due to the extra sunlight, though lots of things can trigger it.
It's either your plants are making lots of O2 and it's collecting or you have a damaged leaf and it's "venting" out the damaged area. Overall, if your plants are pearling, it's a good thing. Shows they are growing well.
On my 75 gallon (pressure CO2, higher light), I'll get pearling from a few plants ~4 hours into the day. By the end of the day, there are several constant streams. If it's also the day after a WC, the tank can look like an air pump is running and putting out thousands of very small bubbles. (I've had that question asked before).