This is a shot I took two days ago of a plant. Upon a friend's recommendation, I ceased using my nute program and dumped my solution entirely, using only water and hygrozyme, ph'ed to 5.7. Now, some more spots started appearing on one of the newer leaves yesterday, just isn't as full-spread as this one was (this is on the first true set of leaves).
I'll try and give as much info as possible. Room is kept 74-77 degrees at all times, plenty of air circulation, humidity is 55-59%. Light is a 400 watt MH that is approximately 14" from the plants. Last nute mix they got was 2 mL Micro, 4 mL Bloom, 3 mL Cal-Mag, 8 mL Liquid Karma, 6 mL Hygrozyme, and 5 mL Sweet - all in per gallon values. I realized now I should stop using Cal Mag for the time being and reduce my value by half for LK, which I was planning on doing with the next rez change in 2 days.
Yesterday I noticed the same spots on a newer leaf (same plant) even after I had changed out the water, and also noticed the spots forming on another plant that was still in nute solution. So I dumped that one last night and mixed up 8 mL/ga Hygrozyme and water. Leaves still look worse this morning. Any idea on what is causing this? Incidentally, I have some (sometimes only 1-2) of these spots on 4 out of 8 plants...Should I just assume all will turn like this, and start them on a diet of only pH'ed water for the next week?
I'm also having the hardest time keeping my pH in check on these two buckets with only water and hygrozyme. In 8 hours, it goes from 5.7 to 7.5, and there's no way I can be adjusting more frequently than that to keep it in 5.7-6.2 range.