Apple Strudel something is wrong

hello normally according to your image, here is the diagnosis for your 9 day old seedling: ​1. Burning by “magnifying glass effect” vs. Nutrients ​The droplet hypothesis: This is a classic beginner's mistake. If you have watered and drops of water remain on the leaves under a powerful LED, the water actually has a magnifying effect and can burn the tissues locally. The brown/rust spots on your leaves look a lot like this. Nutrient deficiency: In Biobizz Light Mix, there are enough nutrients to last at least 10 to 14 days. At 9 days, it is almost impossible for it to be a deficiency, especially on an automatic which consumes little to begin with. ​2. The pH problem ​If it's not water on the leaves, the No. 1 cause of spots on a young plant is often an inappropriate pH. If your watering water is too hard (pH 7.0), the plant blocks the absorption of certain trace elements (such as manganese or calcium), which creates these small rusty spots. ​3. My advice to save the little one ​Targeted watering: Only water the soil, never the leaves. If water falls on it, gently dab it with a paper towel. ​Distance from LED: At 9 days, make sure your lamp is not too close. Too much intensity on such a young plant can weaken the leaf tissues. ​No fertilizer! Above all, don't add anything now. Your Light Mix does the job. Wait until the plant has at least 3 or 4 layers of leaves before thinking about Bio-Grow. ​In summary: Don't panic. The new leaves emerging from the center look very green and healthy. If the spots do not extend to the new shoots, it was just a small accident (water or light) I hope I was able to help you have a good day.