Hey Gary, sorry to hear bout the sprouts. Couple things jumped out at me. One is the lights being 18” away from seedling 18” is pretty close in flower for most lights try backing it to 32-36” if the start stretching you can move it down. Second is the picture witch always help to see what’s going on the look like the are burning up not sure if it’s a light thing or soil. For the humidity I used the same pots your using I just put a ziplock bag over the pot with couple of holes in it will bring it up to the 80’s I do it every grow. I do like the pots because you can drop the whole thing in pot when you transplant and roots will grow through the pot. Hope this helps.