Hello all. I need help with trying to figure out this issue. I think it's a potassium deficiency. There's also these yellow spots on the leaves. I'm headed to the garden supply this afternoon so I want to know what I should pick up. Thanks in advance. Here are some pics: 
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Yes ... or ...
A ph problem that's blocking potassium.
Or ...
It can be the result of root damage. I missed a watering for a few of the plants I have growing now, and the plants have been extra sensitive since then. I get the same thing from those plants. Plants with undamaged roots, no problem.2'x2'x5' Custom Breed & Seed Cabinet w/ 4 Roleadro flat-panel 75W lights
2'x2'x5' Custom Seedling, Clone & Young Veg. Cabinet w/ CFL & flat panels
2'x2'x5' Custom Veg. Cabinet with Vipar Spectra XS 1000 Dimmable
2'x4'X6' Custom Flowering Cabinet with 2 Vipar Spectra XS 1500 Dimmable Lights
100% Perlite, 2.7- Gallon nursery pots, Fertigation method.
Miracle Gro Vegetable & Herb Fertilizer (includes Soy Protein Hydrolysates), 1 tsp./gallon as base nutrient, supplemented with standard Miracle Gro for high-nitrogen plants, and Miracle Gro Bloom Booster during Flower. A bit of Ph Down to take the edge off. Touch of Cal-Mag as well.
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