Fert burn or K deficiency?

[Rusty Trichome]

So, if PH and fert burn are not the problem (burned leaves), what can it be?

What do the instructions on the bottle say about dosages and frequency of use? Most nutrient products give a weekly schedule. (one application at recommended dosage per week) None I've come across are a 'feed every watering' formula.

Your growroom would benefit from proper lighting. Incandescents, HQI's, grow spotlights are all garbage in the growroom. Too much heat, wrong spectrums. CFL's, fluorescent tubes or HID lights are optimal. (in the correct spectrums, of course)

That's still my answer. ^^^

Humidity is a little high for me, but I've seen worse.