Lower yellowing leaves

Howdy, Ive got 6 kush plants 3 months old, 12/12 under 600 flouro. Given em all purpose miracle grow, G O bloom food and just gave em a shot of camg 1/2 dose to start. Should I expect results? My last grow went without incident. I did change to some miracle grow soil this time too....WTF.....My second indoor grow. Any opinions would be greatly appreciated. Same plants growin outside in DIRT (was tryin to get rid of em) are 6 feet tall and weighty! Thanks again....mcloadie....ps could this be weak ass lighting issue? Last grow was half as tall.....my induction comes today
 
The question is as I asked, " should I expect favorable results with the course of action I have taken "...thats all. Could my shitty lights be too weak, causing the lower leaves to yellow? Could my soil be nutritionally depleted at 3 months? Maybe I was a little loaded when I wrote my question, but like all stoners, I knew exactly what I was talking about....thanks
 
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