Low runoff ph

I'm using ffof for my first grow and I'm in my 1st week of veg. I tested my runoff PH and it came around 5 something.. I usually water with ph between 6-6.8... is the runoff ph important?? By the way my plants look healthy but I wanted to be for sure if the runoff mattered because I read it does matter but then I also read it dosent matter as long as you by your water correctly before feeding...Any help would be nice
 
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