HELP PLEASE

Hola amigo, el silicio no parece el problema, no somos expertos pero parece falta de nitro y añadiríamos cal+mag, saludo y esperamos que te ayude, feliz cultivo 💚🍀🌱🍀💚

The plant is very hungry. And the soil looks very dry. The roots have not been able to grow normally and has stunted the growth of the plant. The conditions of your soil are likely causing lockout of any nutrients in there. The silica didn't cause any harm. You don't have to start with a new plant you could though, and it would be better off from the start, but you could revive this too if you wanted to it's up to you. I would start by completely soaking the pot with a pH balance feed. To around 6.0 and a even NPK. I've had a few orders that had rough patches, but was able to revive them. Ultimately, you'll learn more in the long run by just finishing up with this one and seeing what you can do with it, but it may not be apparent for a while until you grow some other plants.

Week 6 auto! I think putting another seed in the ground is needed pal..

Don't panic, a first grow is a learning curve. Silica at 1 ml/l is normally harmless, so I doubt it's the main cause. At 6 weeks this auto is very small and pale, which points to a root zone problem: pH, overwatering or a pot that stays too wet. In coco/perlite keep runoff pH at 5.8-6.2 and water only when the pot feels light, with 10-20% runoff. Pale yellow-green leaves usually mean low nitrogen or a pH lockout, so start a gentle feed (about a quarter of the label dose) with pH 5.8-6.2 and raise it slowly. Don't top or stress her now, autos have a short life and she needs to keep going.

Sieht aus als hätte sie massiv Hunger. Dein Substrat sieht aus wie Kokos. Dafür wäre die Menge an Dünger die du gibst viel zu gering. Vorallem bei Kokos solltest du eher auf mineralischen Dünger setzen, bei dem die Nährstoffe direkt verfügbar sind & nicht erst verfügbar gemacht werden müssen. Viel Erfolg 👊🍀🤞🏽