Still trying to solve leaf discoloring.

[Co2BUDS]

Hey guys,
Has anyone seen this before? I can't exactly pinpoint the cause. They are about 2 weeks into flower and only one of the 3 Black cherry cheesecake cookies show this. Tried some recharge in the soil maybe thinking it was a lockout of some short, did not cure.

Soil: Michigan M3
Nutrients: light feed of Gaia green every 3 weeks
Temp: daytime 81f, nighttime 63f
Humidity: 60%
Light: Gavita 1700E about 2 ft above plants
Co2: 1200 ppm
Water: RO with 1.1 ml of Calmag per liter.

Any suggestions greatly appreciated!

 

[TripsRabbit]

Purple petioles usually means magnesium deficiency. Epsom salt is magnesium and sulphur.

 

[GNick55]

plants like an up in calmag usually third/forth week of flowering,
than usually in up in P&K after.
so don’t go adding more calmag, you can up your potassium to help with her taking up magnesium..

 

[GNick55]

this may help in understanding?