My fist ever grow

Low nitrogen based on symptom. I don't see other symptoms, so it's hard to make any other assessment. If this is "light mix" it comes with a light charge of nutes and needs fertilizaton within a week or two. Your addition amendment "biotica" amendment needs to be considered.. i have no idea what that is offhand. 1ml/l depends on concentration of the product. it might mean 10ppm it might mean 100ppm. There's a difference between dose and concentration even though one obvioulsy causes the other, but in this case a necessary bit of information is not given. I don't think this is silica related. You only need 10-20ppm of that to maximize its benefits, if i recall. (reference information can be looked up, no need to memorize) big pot, tiny plant = difficult to water properly, which dominos into multiple other potential problems, like nutrition. In 7+ years i've yet to see a plant stall from simply potting up. Even with autoflowers, you should use size-appropriate pots. It's something new growers, including myself, resist, initially, but once you start doing it you typically see the benefits and keep doing it. Orthodox watering procedure 1) fully saturate the pot (with 10% runoff, if soilless) 2) wait for appropriate dryback/loss of weight and repeat In a big pot, tiny plant context you can't do that... you want to water a smaller circle about as wide as the canopy, but make sure that moisture goes all the way down. Superficial water leads to problems or less than idea root growth. Fertilization with soil it's just a trial and error thing... you have to learn how to supplement fertilization needs over time as the soil's nutrients get exhausted. The soil product you use or the amendments you add will change that equation, but once you do it once, it's much easier the second time. If you want something less unknown, go soilless/hydro. It's an easy button by comparison as far as knowing what to feed. You simply feed a full spectrum, well-balanced diet and there's less guesswork when you provide 100% of the nutrition through fertilization. A good formula will require minimal adjustment to your local variables... Good ratios will hold up, but overall concentration is most likely what needs to be tweaked. Regardless, while learning take notes. Fertilization is a culmination of every choice from the start... it's often less about what you did last night and more about what you've done for weeks or even months. The plant can't excreete the nutrition, so it just accumulates if not used. e.g. feed heavy early and may need to feed less later. Unless you do things in a very similar way to others, expect differences in what works best.

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 💚🍀🌱🍀💚

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.