thanks your gonna love the combo. id start around 6.5. If you start having issues then you can always do a few waterings at 7 or 5.8 to readjust. Are you running a journal?Holy smokes!!! those are some phenomenal looking ladies! OK so far, after checking out other grow journals using mega crop and different PH ranges, it would appear that they're all doing just great with ranges on both ends of the spectrum, which leaves me both more confused but also confident that it'll work out either way.