I've been trying to grow my own medical marijuana and created my own grow box its about 3x3x3. I've been using a tiny bit of 20-20-20 all purpose nutrients and have now stopped. I've placed the lights at different heights to test. Right now the seedling has grown to about 2 inches and seems to have issues. Looks like they're burning. This started before the nutrients and have gotten worse. I need some tips on how to grow my first successful plant without getting too complicated. (I will attach pictures of lighting and setup.) At the moment there is no ventilation. I usually put a fan up to the hole that located of the side of the box giving it nice circulation. If anyone can help me getting these plants healthy again it would be amazing. These pictures are 2 days old so they've grown and the burns have gotten worse! I hope someone and/or anyone can help me and hopefully this thread can be some help to others learning. Thanks so much guys! Sincerely, Omnoodle.