Any ideas on what is going on here?

Gavita 1650 led
Advanced nutrients
Dwc

Whole plant is looking like this

k0rn4444 said:

Gavita 1650 led
Advanced nutrients
Dwc

Whole plant is looking like this

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Nute burn dial back your feeding

Been running 1.2 e.c with ro water, you think lower?

Find ya a nice chart that show the effects of both deficiency and excess for each nutrient identify the one that looks closes to your leaves and eliminate it from you next few feedings. The damaged leafs probably won't recover but you will see it stop to spread and get new healthy growth. Naturally your ecm/ppm will drop as a result. Just make sure you adjust your ph so that it is the same as you have been giving or ph shock can occur. Off memory I think I found the one from royal queen the easiest to read.
Flushing with plain ph water to reset your medium I also an option

Just realized dwc. I'm not a hydro guy. But your definitely over feeding

RO water, Have you been adding cal/mag? Looks like calcium def..

HydoDan said:

RO water, Have you been adding cal/mag? Looks like calcium def..

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^^^this guy knows why better then me^^^

Been adding 2ml per gallon of calmag. You think I should pump that up, with my e.c. already at 1.2ish ? Advanced nutrients A and B is 1/2 recommended amount on bottle right now.

I would guess to lower the feed rate will make the problem worse, I’d do the opposite myself, 12 should be good but look at the leaf, if your running high the tips burn first and your tips are intact mostly even with the leaf hammered, clearly deficient imo.

If your PH is good it wouln't hurt to slowly bump it up..
Keep an eye on new growth for improvement..

1.2 is the highest I hear folks running and I see the most damage at the tips. That's why I assumed over feeding. I normally spot cal deficiency by the copper/red spots some are visible in the pic so I figured it was most likely a cal/mag imbalance. I'm a soil guy and still mostly just running the system I was taught and fiddling with it a little here and there to learn. Also a variety is spice of life philosophy so I never nail down exact feed for a given strain. That's why I'm on threads like this to learn from the vets there's plenty here and I'm a self-proclaimed dumbass

Whats your PH? and whats the temp and humidity in the space? I can't imagine with ec of 1.2 constant in hydro that a deficiency would be that bad unless the plant was unable to acces the available nutrients.

edit: on a side note I rarely push my ec above 1.0 (anyhting more typically gives me some burnt tips). However I do run old school ebb and flow in rockwool so I typically get some salt build up over the course of a grow.

2nd edit: Also. How are your roots looking?

84 degrees / 65 % humidity

I use advanced nutrients ph perfect, ph bounces around a bit but usually 5.8 - 6.2

Roots looking great, dwc, chiller, hydroguard

Could this be leaf septoria? Anyone ever have it?

k0rn4444 said:

Could this be leaf septoria? Anyone ever have it?

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I would say indoors that would be highly unlikely. And given all your perameters look good I'll have to go with overfeeding. But I'm a B class grower so take that with a grain of salt. haha

This is start of flower, then the plant goes downhill fast to the point it is completely fried

This is end result week 8

smoked

The only time I've experienced such a drastic change from flip was because of lockout. I respectfully disagree with adding cal-mag. Most times thats a cheap fix for bigger problems. There's nutrients there. Your plants just seem unable to get at them.