need advice

So lower to middle fan leaves are turning yellow and some are spotty. also the other leaves that arnt straight yellow are slowly turning light green and looks like they will eventually as time goes on be affected as well. if anyone can give me advice that wound be amazing! this strain is supposedly a "10 week strain" this is also my first grow so i dont know if this is something common during this stage in flower or not??? this is a problem on both of my plants.

strain - auto blackberry kush (week 7)
medium - soil (pro mix)
fertilizer - incredible bulk 0.1-10-25 and cal mag 1-0-0 (incredible bulk 1/2 tbsp per gallon of water. cal mag 3 ml per gal.)
light - mars hydro ts 1000 (142 watts) light is 15 inches from canopy.
water - almost a gallon every other day
ph- 6.3 to 6.5
ppm run off- 746
temp- 70 to 80
rh- 40 to 58

Flower fade...

I've only known "pro-mix" to be coir and perlite, not soil, if you haven't been giving her nitrogen her leaves will yellow. So not completely unusual. Also later in life the plants will take nutrients from older leaves to nourish her flowers.

pro mix is soil less, perhaps your ph is off

from what ive read it says its soil but i could be wrong. like i said im new to this. i would hate it if ive been phing wrong for the past 7 weeks...heres a link to the medium im using guys.

treat as if it were hydro 5.8-6.2

Johiem said:

I've only known "pro-mix" to be coir and perlite, not soil, if you haven't been giving her nitrogen her leaves will yellow. So not completely unusual. Also later in life the plants will take nutrients from older leaves to nourish her flowers.

Click to expand...

really the only nitrogen ive been giving is in the cal mag im using. idk if its to little to cause the yellowing though. ive also read about plants taking nutrients from the older leaves and was thanking that could be the problem. i appreciate your input thank you!!

kovidkough said:

treat as if it were hydro 5.8-6.2

Click to expand...

okay im going to give it a shot!!! thank you!

noob4560 said:

really the only nitrogen ive been giving is in the cal mag im using. idk if its to little to cause the yellowing though. ive also read about plants taking nutrients from the older leaves and was thanking that could be the problem. i appreciate your input thank you!!

Click to expand...

I run soilless hempys with perlite and find 6.0 works for me but I wander up and down a few points to cover the board

kovidkough said:

I run soilless hempys with perlite and find 6.0 works for me but I wander up and down a few points to cover the board

Click to expand...

Im actually really glad i made this post now! next few waters im going to try using 6 or a little under and see how it works out! this whole grow ive been wondering why i kept having all these issues and everyone i talk to says that this strain is a really easy grow while ive been thanking its been hard... again thank you!!!!

noob4560 said:

Im actually really glad i made this post now! next few waters im going to try using 6 or a little under and see how it works out! this whole grow ive been wondering why i kept having all these issues and everyone i talk to says that this strain is a really easy grow while ive been thanking its been hard... again thank you!!!!

Click to expand...

no problem sharing is caring. I've learned a great deal from others and just running into walls sometimes the latter is a better teacher

Some genetics also do this during flower and there is nothing anyone can do about it. It's very common. IMHO don't stress.