This is my first grow, and I don't know if I have a lighting problem or what.......I planted the following seeds 4 weeks ago today: KC Brains Afghani Feminized; KC Brains Afghani Standard; feminized UFO #1 DNA Genetics LA Woman; feminized UFO #2 Reserva Privada Sour Kush AKA Headband; and, feminized UFO #3 BlimBurn Seeds Tijuana.....Most of them germinated within 2 days. I am using flourescent lights, through a "system" I read online: a mixture of Full Spectrum and Soft white lights, 40 watt bulbs (I could not afford anything else at the time, nor do I know of any other BETTER lights to use).....Ph is between 6.5 and 7.....From all accounts, that is a good Ph.....They are now in 5 gallon buckets with 2" of lava rock in the bottom and a good mixture of potting soil on top.....They are 4 weeks old and are only about 4" tall, on average......Most of them have 3 sets of leaves, with the newest set having 3 "fingers".....The lower leaves are yellowing and the others above them are beginning to yellow.....I give each plant a pint of water every 2-3 days.....and I use a VERY mild solution of MiracleGro/water every other watering (10 small drops of MiracleGro per quart) about once a week...From what I've read all over the internet, they are NO WHERE as big as they should be for 4 weeks old. MAYBE they are not getting enough light....This is my first grow.......Any suggestions? If readers believe I do have a lighting problem, please help and use "laymen" terms because I am not very familiar at all with this.....I do appreciate all replies as these plants do not look anything like I thought they would at this point......Thanks for your replies.