Hi, new grower here, DWC 400 mh/hps i'm about 10 days into veg stage after germinating and my stems are so weak they can't hold up the leaves ... just wondering whAT the problem could be, no leave discolouration, i used a fan to blow on them... it just seems to be weak stems, i had to attach my plants to chop sticks via twist tie to get them to stand up... anyone have an idea whats wrong?