Dutch Passion Blueberry and White Widow Grow

Hey Guys - I think I finally figured out why my plants were browning and dying off before their time - Fucking PH!!!

I was using a brand new $200 tri-metor, the ppm and temp reading seem fine, but the the fucking ph never worked properly and I trusted it!!! It was reading 7, which I figured was good for potted plants.

All my plants showed signs of both over and under ferilization. There are many pics in my signature link.

I recently tested the water with a simple drop kit and it had a ph of about 4...fried the fucking plants!!!!

Here are my eight DP Blueberry clones 9 days on 12/12. They were recently flushed and were just given 600-700 ppm of FloraNova Flower with a ph of about 6.5. These plants were suffering from the same ph problem but I've had them in-check for a few weeks now.

Also tried a new soil, 50% Happy Frog from Fox Farms, and 50% inert soiless mix. The girls are under a 1K HPS.

Any advice on the down curved leaf?

1) ninetine WW from seed in rockwoll
2) eight BB clones in rapid rooters
3) two wild card Afghan X Trainwreck seeds in rockwool that I accidentally created from a hermie!! First sign of balls and they're pulled!!!

OK, does anybody out there know of a good website were I can get some advice about growing marijuana?