Was haben die Pflanzen? Überdüngung? Phosphormagel? Zinkmangel?

The light it's too close

You may be running into a phosphorus deficiency but I would check your medium pH as well to be sure it isn't an uptake issue as well. She's hungry though, that's for sure. I would increase your bloom nutrients and kelp extract foliar spray will help with the deficiency.

I dont see any magnesium here. I see more nitrogen and potash toxicity.

Magnesium deficiency and nitrogen deficiency.

Google rather iron or magnesium deficiency... phosphorus deficiency is represented completely differently on the internet.