Any idea what the deficiency is here?

This deficiency is on only 2 branches. The issues is at the top of the plant. The plants aren't too close to the lights, the temps/rh are good, the ph is in a good range. From research I have done, it looks like it might be an iron deficiency, what do you guys think? The leave is pale whitish/yellow on the edges of the leaves. The plant has also undergone heavy LST, so I'm not sure if this is stress related or not. I am using Dr. Earth organic dry amendments. Please let me know, thank you for your help!

Im leaning towards K def.Outside moving in.

mistergrafik said:

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well thats super helpful ha

myke said:

Im leaning towards K def.Outside moving in.

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I agree it looks like a K deficiency, but I thought K deficiencies start at the bottom of the plant and not on the tops since K is mobile?