i cannot stress what roseman said enough. on this grow (second) my tap water was up around 6.7 or so. i grow in soil, i tried to lower it just a bit down in to the sweet 6-6.5 range. i over used ph down, and locked out nuts for several weeks, most never fully recovered. i lost TONS of fan leaves, and others too. my secondary buds, not the colas, should have been a several inches long at least. they ended up as smaller popcorn buds. as there were just not enough leaves around to utilize the light on those sites. i dont know how much i hurt my yield, but i know i pretty much gave it a swift kick in the balls. im just short of 4 months from cracking seeds, 7 weeks flowering 10 plants. i should have IMO get a good LB at least. i will probably get closer to .75. running a 600 watt hps in 6x6x8 room. i will no make this mistake again. learn from my mistake..