You're not using one of these, are you? http://boards.cannabis.com/plant-pro...-anything.html

Not sure about your watering method and schedule, but just wanted to say it, that you should always water them until you get a little run-off from the bottom. Then wait until they are almost dry again. I check the weight of the pots.

How are you checking your ph? What is the ph of the water going in, and coming out? I see you said 7.0-7.2, but if you are using color coded strips for the run-off, the tint of the run-off may skew your results.

Hopefully some of the 'doctors' here with more experience can help you more. Good luck :thumbsup: