What type nutes have you been using? Also are these in soil?

Herbus
Herbus Reviewed by Herbus on . Any advice? Hey all. I've just started noticing some leaves curling upwards and brown blotches developing on one of my plants. It's mainly affecting the biggest plant but I can see small signs that it's moving to the others too. I'm at 38 days of flowering now and at first I assumed it was a magnesium deficiency but the red stems are starting to make me lean more towards potassium deficiency. Just to double check my PH I went and bought a aquarium PH test kit and it was dead on 6.2. Yesterday I watered Rating: 5