i have a reverse osmosis water system i kept the ph at 5.8 to 6.0 never higher never lower. the ppm were actually high i mixed everything to the faxfarm feeding guide but the ppms were always high. i was told to use the ppm reading as a reference and maintained it at 1590 - over 2000 my meter goes off the chart at 2000ppm. never had any problems with the leaves turning yellow or any signs of nute burn. i think the difference in my plant hight was due to a planter that was too small. so on my second grow i am using 2 2'x 4' planters with 14 babies in each one? most of the clones came out to about the same height but ther were a couple that just wanted to grow taller then the rest. i topped them and pruned were i thought was right and am getting more konas. but i see this grow going a little better but i just do not have anything that looks like some of these other growers pics.