Potassium Deficency? or something else?

DWC/Waterfarm, Organicare nutes

I'm having a hell of a time adjusting to the Organicare nutrients. I don't know whether the pH is way off, or there is an actually deficiency.

Any help is + rep

It's very important to get your ph in the sweet spot to uptake all the macro and micro nutrients, which is between 5.8-6.5.

How much light are you pushin on them, how close is the light to the canopy. Almost looks like to much light, but not sure

wizard82 said:

It's very important to get your ph in the sweet spot to uptake all the macro and micro nutrients, which is between 5.8-6.5.

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Do you use a digital meter? Since I switched to Organics, the water is always dark brown, so i can not use the GH pH liquid tester. I read mixed things about digital pH meters, so I haven't bought one yet.

I've changed the res and added acid to bring it down, but I'm afraid of adding too much.

stilljonzen said:

How much light are you pushin on them, how close is the light to the canopy. Almost looks like to much light, but not sure

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It's a 400w hps. I know it's not light burn, but thanks. It's hard to tell from the pictures; I don't have a great camera.

Potasium deficencys cause rusty colored leaf margins, spots and blotches. Yours looks more like a sulfur deficency.