Could use some advice

[George]

@Cmoore2382va

What’s going on everyone. I’m a first time grower new to the site. Wondering if I could get some advice. I measured my runoff and got an e.c. of 5.0 my ppm was 3800 and ph 6.4. I have no clue what’s going on. Here’s all my variables 1. Outdoor grow
Ro water
white widow fem seed ilgm
It’s fem photo
Plant is 8 weeks from germination
soil is 50% happy frog 20%coco 10%ocean 10%hydroton
Black 7gal fabric pots
Ph and tds of source water is 0
I’m feeding with ff trio plus calmg recharge i feed half of recommended dosage. Ph at 6.3ish and ppm around 800 at this stage.
Temps in the day have been in the 90’s and upper 70’s at night.

Now I’m getting these black leaf tips and yellowing of the lower fan leaves.
Thanks for the help.

Please don’t open a second thread with the same issue, could have a nutrient lock, keep flushing until you get normal numbers, don’t worry about the old leaves and concentrate on new growth …