20$ Budget grow

Its been 24 days since I planted my sprouted seeds I've been doing this grow with little to no expenses just had some decent cbd seeds I got from a buddy. All three plants seem to be a step ahead of each other. My weakest plant seems to be doing bad. I looked up a few deficiencies online and tried comparing them. I'm not sure if it's heat stress, mites or any nutritional needs. I'm literally growing these buds in my closet with 2 100w Led/cfl grow lights I got at home depot for 10$ and I have them inside a 2x2 feet wide box to help maintain the plants as they grow. As far as nutrients and soil for the transplant I'm still not sure what route to head towards. Any kind of advice or tips would be greatly appreciated.