First Grow Doing Great but Slight Problem, Please Help w/ pic

Jack Herer, Fem, 4 days into 12/12. Using Botincare Pure Blend Pro Green.

Light 400 HPS , average 80-88 Degree, 30-40 Humidity. 3 fans in room.

Flushed two days ago and not fed nutrients for a week-1.5 weeks.

My bottom most leaves are the leaves with the most discoloration and edges having problems. Throughout the plant until the top 5/8. No real signs of discoloration or spotting. However some of the edges throughout the plant are burning and there is slight curling on some leaves. Here are pictures.

Please help : ) Thank you!
 

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