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Where did you get on this? I'm growing my plants on wire shelving racks and I have enough vertical space to add a shelf with a mushroom bin. I would put it above my light shelf so the co2 sink to the plant at the bottom shelf...still not sure they would put out enough co2 to be worth the trouble.

So in a pinch if you just wanted to give your plants a boost after a tragedy stunts there growth, dry ice would be perfect. But as a CO2 supplement throughout veg and flower... Not very economical...

Regular ice is made from H2O, not CO2. So melting normal ice would do nothing for your CO2 levels. H2O ice just melts into liquid H2O. Dry ice IS CO2 in it's solid form and melts into the air as gas CO2. Dry ice would definitely increase the CO2 in a tent as well as cool it. The question still...