The beauty and strength of your seedlings depends on potato starch.
This kind of feeding will be good for her, and besides, it is an inexpensive product.
It is retained in plants and then converted into glucose, which is a source of energy for seedlings. It contains vitamins P and K.
Add a teaspoon of starch to each container and carefully mix it with the soil.
Watering will provide beneficial elements to the seedlings.
If the container is solid, you need to sprinkle the starch in a thin layer.
Try feeding your seedlings this way and you will be surprised by the results.