My diy co2 - have a mixture?

[evil Nick]

This is my attempt at co2 before I spend cash buying a system. I have my yeast but does anyone have a good mixture for a 29g setup fairly densly planted?
These are 1 liter bottles for now.

Thanks



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[evil Nick]

Whoops I have to change my valve placement. Lol

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[HyperSynergy]

I seen this youtube video and it covered what you were doing plus I believe gave the mixture.