Anyone seen this before? I've searched and not finding a specific answer. No pH kit or meter. What I do have doesn't work so I'm going off memory, but all broken equipment aside it should be 5.9/6.. The yellow leaf is the only one. Now those brown spots, that's on a few leaves and may be progressing. Won't know, I did add nutes which spilled into the hydroton. Again won't know till later if it worsens. I have 100ppm calmag and 500 nutes mixed according to GH Trio bloom & flowering schedule. Which is 1 grow, 2 micro, 3 bloom for 1-2-3.