I have a plant issue in my bloom tent, leaf symptoms of a deficiency, brown spots, crispy spots and tips. My pH stays at 5.9 in a gravity drip system using distilled water with weekly supplemental hand waterings of fox farms nute solution (1/4 strength) plus CaMg and hydro guard in fox farm soil. I don't add the solution until a plant has spent two weeks in soil. Never had a problem but I recently switched up lights from less then 400 watts of LED light to 900w (600w + 300w panels in a 3x3' tent). I'm starting to wonder if the real issue is light/heat stress from too much LED light. Temps stay under 80 with circulating and exhaust fans. I was worried it was a nute lock out but pH is good and I haven't added excessive nutes, I have added enough nutes to know its not from a true nute deficiency. Thoughts???