Problems with leaves, looks like curving

I have two plants growing as of right now one is probably day 8 and is healthy but it now showing the same signs as the other plant thats probably 12 days old. My problem is the first set of fan leaves starting to curl up in one place that is directly opposite on the other leaf. I will post pictures of both plants but its alot easier to notice on the larger plant. Also notice that the stem is green for most of the way up but then turns a purple color on the larger one. I am currently growing with miracle grow medium with 4 tb garden grow light with shield that are 4 feet long and 2 26 watt cfl. Just started nutrients last water which was roughly 2 days ago. leaves had the problem before i added nutrients any help
Temperature are usually around 75-79 degrees and Humidity is usually around 32 percent.


nutrients are technaflora

please help:joint:

Could it be not enough air flwo
 
I have two plants growing as of right now one is probably day 8 and is healthy but it now showing the same signs as the other plant thats probably 12 days old. My problem is the first set of fan leaves starting to curl up in one place that is directly opposite on the other leaf. I will post pictures of both plants but its alot easier to notice on the larger plant. Also notice that the stem is green for most of the way up but then turns a purple color on the larger one. I am currently growing with miracle grow medium with 4 tb garden grow light with shield that are 4 feet long and 2 26 watt cfl. Just started nutrients last water which was roughly 2 days ago. leaves had the problem before i added nutrients any help
Temperature are usually around 75-79 degrees and Humidity is usually around 32 percent.


nutrients are technaflora

please help:joint:

Could it be not enough air flwo

here are the pictures
 

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