My 1st time growing. I decided to make a growbox out of 18" cube cardboard. Im using led DJ lights for the grow. Soil from my back yard. (Live in south Florida) soil is a bit sandy but my plant is aprox. 4.5" tall after 3 weeks. Im noticing now that the leaves are becoming dry and curling in half, the long way. Prolly heat. Ive changed the leds from full on white to now only using blue light.