Actually, I poured a little bit of Coke into my plantpot because I didnt want the rest and couldnt be arsed with keeping it. I thought 'what the hell, Ive got like 100 more seeds anyway'. This was at day 20 if I remember correctly, and done on a Lowryder. I didnt notice anything good or bad for it, but it was only about 50ml done once.
Oh, and CO2 isnt good for the roots, oxygen is