One week old is too young for nutrients. How fast do you expect one week old plants to grow, lol. Nutrients do not make your plants grow, genetics and light determine the rate at which your plants will grow. If they are underfed they can be stunted, but at 1 week that is impossible. The seed holds enough nutrition for them to get through about 2-3 weeks. At that point you need to add nutrients, but about 100ppm. Nowhere near the strength on whatever bottle you are reading.
Do you have any pics to post and share?