miracle grow resulted in yellow leaves

we decided to use a miracle grow soil mix. my guess is either that there are either too much nutrients in the soil or too little. watering has been well monitored and the pH levels kept around 6.8. using a 24 hour light cycle. perhaps someone can recognize these curling yellow base leaves. it started at the bottom and is slowly creeping up. plants are about 5 weeks old. any thoughts/suggestions would be appreciated

thanks
 

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They look over watered for one. I'm also only seeing very bottom set dying off, but new growth already replacing it with branching. chill
 
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