Yellowing, spotting, old growth

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My hay like harvest from earlier this year
Hey all, I am seeing yellowing as well as some spots. Could very well be N def and Calcium def, but wanted to get an experts take. Appears on older growth

Age: 6.5 week old autos

Strain: 2x Sour Stomper, 2x NCH x Sour Bubbly (both Mephisto Genetics)

Medium: Fox Farms Coco Loco (treated like soil, buffered to 6.3 to 6.8)

Feed Schedule: water every 3 to 4 days (I let the pots dry out), feed every watering. A base bloom, bloom builder, calmag, and smart tea. pH'd to 6.5 every time. I go through about 2/3 gallon per plant at this time.

Water temp when feeding: within 5 degrees F of air temp in tent (not sure if that matters)

Light: 450w Mars Hydro TS3000 on 24/7. Distance is 9 to 13" from canopy (depending on the plant)

Temps: daytime upper 70's to mid 80's. Nighttime upper 60s to lower 70s.

rH: 35 to 45%, sometimes upper 20's if I don't fill up the humidifier res.
 

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Glad I was able to receive so much help.

Ended up being a pH meter issue.
 
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    EP3

    points: 10
    Glad you figured it out. Hopefully she perks up.
Glad I was able to receive so much help.

Ended up being a pH meter issue.
Sorry I missed this earlier mate. Was the issue calibration? How did you figure things out?
 
Good job on getting it sorted!!
 
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