I think you need a medium with less sticks and tree bark in it. I had the same problem with miracle gro, and it looked like that. My plants came out yellowish, and looked to be nute burnt by the end of week one. I changed to some better soil I bought, and BAM, they're looking healthy and growing like wildfire. Some people swear by miracle gro, but I have had nothing but bad experiences using it. I don't know if that is what you're using, but you may consider getting some better soil from wal mart, I got mine for 3 bucks a bag.
I am gonna sub to this, your set up and mine are very similar, and you started like I did. Take a look at my grow in my sig.