Hey all, I am running a GH Rainforest66 aero sys, 17gal res but only fill to12 -14 gal. Im using GH 3 part nutes and mollasses. My PH is 5.9-6.3 and my ppm's are 1300. They seem to be doing ok and there is about 3 wks till harvest. Is this normal for my ppms to be that high? Thanks