First grow perfect tree tropic'ozz

Hi 🙋‍♂️, In combination with the rather light leaf color, it most likely indicates a nitrogen deficiency. However, it could also be an early potassium deficiency. If your plant is just entering the flowering stage, it’s more likely to be that. Based on what’s visible, I would give a little of both. Hope that helps. Good luck with the rest of your grow 🍀👊👌

Most probably aftermath of watering with wrong ph. For future, put sick girls to natural light and then make photos, now under leds they look pale in question photos, but in diary, they look okeish, except reddish leaf stems. I would add magnesium ( epsom salt works best and cheap, not more than + 100ppm to your numbers ). Its not calcium.

Read this and sort your ph. Plenty of pictures too ... https://www.growweedeasy.com/cannabis-plant-problems/ph-fluctuations Soon bigger troubles will start if you won't sort it !

Was that runoff EC or the EC of the water you pour in? seems low for runoff, so assuming that's the water going in. ec of .9 is probably on the low side, but it depends on a lot of other factors. in soil, it's almost certainly low, but that too depends on what the soil is adding... if soilless and using near-zero ppm RO water, it may not be too far off but still on the light side. The damage i see here is potentially due to watering habits.. .maybe too frequent? But, could also be related to nutritional balance, given the low EC. EC is a important on its own, but it's not very accurate when it comesto assessing concentration of nutrition... e.g. depending only on the brand of the device used, you may see a 40% difference in the conversion to ppm. That's highly inaccurate. The reddish stuff is probably genetics or colder temps at night (anything below 68F potentially causes it... they are "Autumn" colors, same reason you see color change outside) Tough to diagnose these symptoms, which is why i think it's in some part related to irrigation.. moving up the plant so it's one of the more mobile options, which helps. Maybe, low P? But that might be confusing the effects of automn colors displaying - low p will add a blue hue to leaves or even some purple-blackes blotches starting on lower leaves. You can look at a leaf symptom chart and see your options. Maybe, just a 10-15% boost across the board would help? Since you are already on low end of EC values. If temps are dropping low at night, get that fixed.. might also be the cause of problems... a little cold won't ruin anything, even if less than idea. A bit of fall colors is fine, but the cause of these fall colors is too extreme it'll fuck with biological process too much and cause more serious problems in the plant. Various reactions it depends on will be hindered...