Need some help guys. This is a northern lights at day 11 of flower. She's been showing this mottled color for a while now and I'm not sure what it is, but thinking maybe a slight magnesium deficiency. This is a soil grow (black magic) using FF trio. I started at 1/4 strength, but have worked up to 1 gallon of full strength per week. I'm alternating water and the gallon of nutes. Overall, the plants are pretty happy and growing well, but not sure about this color. She's been a real touchy bitch despite been supposedly easy to grow. I've had to keep the nutes pretty low because she keeps showing yellowing or browning tips. Oh, and lights are 300w of HLG QB132 at about 16" in a 2x4 tent. Any help would be appreciated.
Edit: I ph everything that goes in to about 6.5. Haven't checked the runoff in a long time because its tough to get at and I rarely have much. The stems are mostly green, but some do have some purple stripes. The petioles start green, but turn purple as they mature. Also, the water I'm using is pretty good city water with chlorine that has been degassed for 24-48 hours prior to use.
Edit: I ph everything that goes in to about 6.5. Haven't checked the runoff in a long time because its tough to get at and I rarely have much. The stems are mostly green, but some do have some purple stripes. The petioles start green, but turn purple as they mature. Also, the water I'm using is pretty good city water with chlorine that has been degassed for 24-48 hours prior to use.
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