Is there a nutrient deficiency? (Sorry for asking a similar question again, but there are more symptoms now)

Biobizz Light Mix is a very mild soil , it's great for seedlings but only has about 2 weeks of nutrients. You’re on Day 20, and autos don’t wait. She’s already entering early veg/stretch. Wind and 32°C heat can dry out the medium fast, increasing transpiration and stress – especially on edges and tips. The rust-colored spots and crispy tips are early signs of: Potassium (K) deficiency (very common around week 3-4 in autos). Possibly early cal-mag issues, worsened by heat or water quality (soft water or filtered rainwater can lack Ca/Mg) Hope this helps😀

How often are you watering? Substrate looks dry. If gets too dry, can cause ph drift and some nutes will be hard to be taken up by the plant. Especially calcium and potassium. Depending on what the medium is determines how the the wateting method should be. Soil and coco are different. Could just be watering habits or could be nute related. Just something to think about. Best of Luck! Happy Growing!

Nährstoffbrand der Stufe 1 einfach spülen dann gehts weg ;)

You can look at a leaf symptom chart as well as anyone. There's a few 'maybes'. mg-def k-tox ptox or def Some immobile/less mobile nute, if it is nute-related, with similar symptoms. A lot of them can cause tip burn - even some deficiencies. When you can't be confident, be patient. If you can appy greater info/knowledge in person compared to these pictures, you can eliminate possibilities and make a more educated guess than someone can with what is provided in this grow question. LEaf symptoms are not often discrete. You almost always have to eliminate other possibilities. Being systematic about how you do things can help greatly. Fewer moving parts = easier diagnosis. I don't think heat or some combination of heat and low RH (high vpd) is the cause here. Unless you recently moved the plant from inside to the sun - and even then the damage would start at the top. bright side -- it's slow moving. Take your time. Don't do anything too drastic without being confident. Some stuff yuo can do that isn't intrusive, like ph-check the runoff... probably limited options in regard to heat, if outside, lol, but you get the point.