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Those bubbles that you see is Oxygen! It's the by product that comes from photosynthesis. Plants take in CO2 and they give off O2. That means that they are growing.

For the first Q it all depends on what plant and it's nutrient needs. Most plants can go for a day or 2 without out a problem. But it's best to have a balance between lights on and lights off to have proper growth in your plants.
 
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