Leaves Curling?????? Please Help

i use the liquid ph meter and when i test the feed its a light yellow which should be around 6.0, and i have only been putting nutes for 3 weeks now.........
 
those things that come with the nutes are crap and are never right. flush that plant for a few days or its gone by tomorrow. I have done it and seen the results and you cant imagine the speed at which it dies.
 
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