DIY CO2 generator at night

Sooooooo… My girls are…?? 12 days old counting from germination day?

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When you look at nutrient schedules they will say: “week so and so in veg”. So, figure in two days you are entering week 1 of veg.

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ok perfect thank you

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A small yeast co2 generator is not dangerous. I have plenty of experience brewing beer. Multiple 5 gal batches of beer will put off significantly more co2 than a small generator and still not be problematic.