eating around 100 ppms per feeding until i added some cal mag to this one plant.
temps 78-81 RH 45-58
Plants are 7-8 weeks in veg, ready to flip to 12/12 soon
The plants likely locking out. Get your pH down to the 5.8-5.9 range and she’ll be fine
Slight cal-mag is what i see.
If ph is coming out 6.5-6.8 i would do as @Underthestairs said and go in at 5.8 to try and get it to drop a little.
But its not locked out and I wouldn’t do anything drastic to drop it, plant looks healthy with a little magnesium deficiency with the yellowing in lines like that and the brown could be calcium, the magnesium I’m fairly confident on 
Go in next feeding at 5.8 with good amount of runoff to sorta reset things and i believe they be fine…
I have some cal mag should i add some to the mix ? Thanks for your help
How often are you feeding? I have run into the same thing with coco now I buffer it that problem went away. Coco needs to be watered for run off daily.
I buffered it once. I been feeding every day to runoff, except today i did a slight flush with ph’d water at 6.0.
If you flush with ph water to get the numbers inline be sure to add nutrients rite after. Coco has sodium ,sodium likes cal mag so it takes it from the nutrients. To add cal mag once in awhile is fine.
