Throw the liquid tester in the trash..........runoff means nothing. Need to know the MEDIUMS PH by using a soil ph tester, depending on your $$$ situation I recommend the following :
http://www.amazon.com/Bluelab-Soil-p.../dp/B004NQ1Y70 expensive but dead accurate, if your planning on growing in soil long into the future it's worth the investment.
http://www.amazon.com/Rittenhouse-82...=soil+ph+meter cheaper and still quite accurate but has a short probe.....id prefer to hit the root zone
http://www.amazon.com/Rapitest-1835-...=soil+ph+meter cheapest and still kinda accurate IF you polish the shit out of the probe with fine grit sand paper before each use, Can also buy the analog versions at HD or lowes for $15 bucks but you must use the sand paper and test RIGHT AFTER you water the girls...
test asap and see if your between 6-7.....then fix what's necessary(looks like a K def too me)..........good luck grower