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That's mold buddy..... damping off... I guessing they have been overwatered and/or the rh is too high

Absolutely N toxicity. That's y I noted dark green and waxy, not horrible though

Doubt it is septoria, looks more like calcium deficiency caused by pH dropping due to "salt" build up caused from not feeding with enough runoff to leach old nutes out of the soil. Check the pH and ppm of your runoff... Looks like a little heat stress or over transpiring too

Waxy looking, dark green w/ burnt tips. If this is an older leaf did it just start?

What medium? pH? pH of runoff if applicable? Type if fertilizers and ppm in and out? Type of lightning and distance? RH and temp?

Hey brotha I was fighting the same problem with salt build up. All the replies above are solid growers. Here's a few pics of my salt build up, plus I burnt them foliar feeding with Epsom salts. Good luck bro. First pic is a week before the second btw.

Definitely a mag deficiency. And looks like your pH has been a little erratic as well. If it's a salt build up your runoff pH will be acidic and ppms will be high

Add some air circulation, i mean as many FAEs , fresh air exchanges, as possible. As long as your "outside" air RH is below 55-60%. Of course the lower the better any mold or fungi. Lower the pH of your leaf surface might work too. Or a milk or carbonate based spray.

Looking like a magnesium deficiency, I have no experience with Coco so I would follow the advice already given by experienced Coco growers. Looks like they are developing flowers nicely. Kind of confusing thread title....

Imo that would be Nitrogen toxicity. Dark green, clawing

I usually up my ppms until my leaf tops look like yours and then back off the ppms a bit, but my medium choice is soiless so not sure how hot your soil is.

I wouldnt try to stretch her, give her more time and you'll have plenty of branches to choose from. She looks a little young for cuttings ATM. Cuttings will be the exact age the mother is at the time the cutting is taken. Wait a little longer for maturity.

pH and overwatering

What pH do you water and feed with? 5.8-6.2?

Besides the leaf burn it looks like they might be wanting more phosphorus. I don't really have a bloom booster other than slow release, should I just run 1-3-2 through or add some slow release bloom ferts. I guess I could order some PK booster but it usually takes 5+ days to get here and im...

Well the calcium deficiency has been taken care of, leaf stems went from red back to green. Not that you need much calcium after preflower. Should I defoliate all of the affected leaves or just leave them be?

Watered with 7, runoff 6.2 with 200 more ppm.... It's gotta be the spray

Buds still forming nice at least imo

Update. A little worse for wear lol. I tried foliar feeding at lights out with 2tsp/gal Epsom salts. Could that have contributed to this calamity? I mean 6 days after spraying would the leaves be getting worse? The undergrowth looks fine. Never had this problem in 15 years outdoors lol. Just...

Im almost positive it's a salt build up.... How much water do you feed each bucket with? And check your runoff ppm