Pilz?

Hey bro. Could be a number of things. Calmag nutrient burn. It's just going through different things until you figure out what it is. If it is a fungus you'll be able to wipe it off? As I said could be a few dif problems but they way irs all curled. My bet would be nutrient burn. Have you crossed any nutrients you shouldn't. Especially if you are mixing dif brands of base nutrients. But with the curling it looks like N tox with nutrient build up burn. Few ways you can go about this. All in all will take a week before it's possibly fixed unless the 1st thing you try is the issue So, first things first. You want to restart your nutrient programme. So hard flush her. Let your dry out for a few days and make sure to grab some water from the flush and do a run off test. Get the ambient water ppm and take that away from your ppm test and you'll know if your plant is eating. If it's eating, it's not nute lock and then you need to try cal mag and check if any of your nutrients shouldn't be used together. Good luck.