Last night I gave them all a good mini-flush with ph 6.7/ 1 drop of st/gallon in, and to my astonishment, it came out at 6.7?! Good to know I guess. I am going to adjust and feed with 6.8 from here on out since it is already creeping downward. They will get the repot before flowering into 3 gallons, so that should help when the time comes.