Exhaling CO2 on seedlings

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Hook up a CPAP face mask tube to you seedling chamber
Gas them while you sleep
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An update: I may have over-CO2-ed. : Just-popped seeds 2 days old, 2-3 inches and extremely spindly. Hope they don't topple. Might be the strain (don't know it pedigree; darn good local seed) that turns into 8 foot Christmas trees. However, others just sprouted seem taller than I would expect.
 
An update: I may have over-CO2-ed. : Just-popped seeds 2 days old, 2-3 inches and extremely spindly. Hope they don't topple. Might be the strain (don't know it pedigree; darn good local seed) that turns into 8 foot Christmas trees. However, others just sprouted seem taller than I would expect.
Add potting soil around the base right up to the bottom leaf from the hull. It will grow additional roots
 
Having a cup over the seedlings will filter out some light and as hippie said, a fan helps strengthen the stems and the cup also blocks any breeze. I think those factors are why the seedlings are spindly.
 

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