Northern Light & White Widow Automatic

High, So when you water with runoff you are probably measuring the runoff for ppm right? This is not the right way to do it because you will measure the build up salts and nutritions that RUN OFF the soil. That is why you water till runoff because you want the build up salts and nutrients out of your pot. And replace them by new fresh nutrients. When you want to measure the pH or ppm from your soil just follow these steps: 1. Place soil sample about ¾ full in sample jar and add distilled water to cover soil. 2. Cap the jar and shake the soil vigorously a few times. 3. Let mixture stand 10 minutes to dissolve the salts in the soil. 4. Place the pH or ppm tester into the wet soil slurry. 5. Measure pH or ppm and record measurement. Happy Growing! 😋

That's called mycelium bro. Its beneficial. It'll go after a few weeks. The plant will eat it up, as it decays it gives your plant a great boost in many areas. Fungus is generally your friend, unless you see it on your plant. You are growing in soil. You have a good thing going buddy. Now, some of it might go green, and look like mold. Even more so if you use any synthetic nutrients like a calmag. Try not to though. (As cal/mag in an organic grow is not good, especially with fungus. I can think of the name, but I know it'll cause issues. So if you can get an organic cal powder or just an organic cal and epsom salt. (If you have water above 170ppm you won't need calmag) but a dash of 250ppm Epsom salt never hurts during late flowering.. Good luck pal.

if referring to picture 14 / 16 at the top of the plant, i'd wager it's light stress. but, those are fan leaves. check ph, if proper that rules it out. could be a bit of bun, but if slow moving or any tweaks lately i'd let it play out to be certain what it is before reacting. By 10 weeks in, you are probably providing near 100% of the plant needs and 750TDS is not extraordinarily high.. it's a generally safe range at which you could potentially feed every irrigation. I can't see any of the sugar leaves in the pictures. I do see some damaged fan leaves.. mostly at the top and some at a node or two down from the top. Still think that's just light damage. 40-45DLI is a good chance of being too high for ambient CO2 levels. 45DLI definitely is.. 40 is borderline. Not all spaces have same co2 levels and your VPD is just as important to maximizing elevated CO2 use too.

Sounds like light burn