Help please!!!! Sick plant!

[Jlfrisco828]

Some of the lower leaves tips are yellow but it's mainly in the upper leaves near the top though. I have cut back on nutes by more then half not sure if it's getting worse or if it's just damage already done but showing more with each day not sure please help it's a strawberry/banana auto on 20 hrs off 4hr and use lotus plant nutes. Keep pH around 6.0 I use spring water from Walmart and fix the ph add nutes and that is how I feed them growing in a supercloset

 

[Del boy]

Hello fill this in it will help sort your girl out also some pics in day light would help
Problem:

Medium/grow method:

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