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Also keep in mind that strains vary in their ideal pH a little bit so when your plants look like yours thats an ideal pH, and there is no difference on the "optimum/ideal" pH whether it is hydro or soil. its still going to be between 5.9 and 6.5 they just are able to accept differences...

Marijuana has been grown in hydroponic solutions with a pH as low as 5, and as high as 7.5 and it will "survive". I've come to think though a range between 5.9 and 6.5 is ideal while a range of maybe 6.2-6.3 being MOST OPTIMUM. You also have to realize that your also testing the pH of the medium...