Hi all. I have my seedling around 12 days since sprouting. They stretched a little so i increased lighting. I have fans on them also. I am growing in coco/solo cups and feed every other day 5.8 to 6.0 with 600 ppm and calmag. Temps at 79, humidity at 50. My plants keep bending over. The stems are skinny and seem to not be "thickening". Any ideas?