An issue!

LordHill said:

My PH is perfect. Growing in FFOF. Nutes are mainly FoxFarm trio, but also hit them with cal-mag, blackstrap mollassis, etc.

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What is the pH of the water/nutrient mix exactly?

Please list the items you ignored listing with the "etc".

What is the EC or PPM of the nutrient solution you're giving the plants?

Also source of the water and how often on the Cal Mg.

Water source is well water, at a little over 7ph from the tap. After mixing nutes, I aim for a PH of 6.5.

I dont know the PPM

The "Etc" are the one offs here and there. Bit of Epsom salt. Bit of potassium silicate.

The cal-mag I generally hit 2-3 times throughout the grow

are you mixing nutes in one big batch or individually? do you shake each bottle before you measure it out? is the problem plant always in the same pot/position in your tent/position under your light? do any of my questions even matter? i'd like to know because i've got 3 plants in flower in my first grow and since week 2 they all have looked different but until last feed, week 4 flower, i kept feeding them all the same but now due to size differences theyre all drinking at vastly different rates.

Between the FFOF, the FFTrio and well water you don’t need Cal Mg or epsom salts. Without details of the fert schedule, I’m just guessing but from the dark green and necrotic leaves I’m thinking excess Ca and Mg is locking out K.