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No, that information is completely false. 6.5 pH is on the verge of too high for hydro. You want to keep your pH around 6. As for the humidity, the plants will grow at 40%. I have had the same issue and the plants still show a nice growth rate. As your plants get bigger they will transpire more and the humidity will naturally increase. You can get a small humidifier pretty cheap on Amazon or hang a wet towel near your fan to help with the humidity. But increasing your pH can cause you a whole new set of problems. Good luck with your grow!