Hard starts

Do not feed the plant in soil. The soil includes a lot of nutrients and that is enough for 2-4 weeks. If you have the TDS meter, measure EC (ppm) of the drain water. Obviously it will be too big. Good idea to use only soft water to rinse out the excess of nutrients. Pour it out before drainage dnd check EC of the water. It should me not more than 2 (EC) or 1000 (ppm). Also check the water and drainage pH, it should be neutral (6-7)

Both previous comments are bang on 👍 just strait ph 6.0 water at this stage for me, and also your probably overwatering as well to stunt it. Very common mistake when starting out is to put your plant directly into your final pot thinking you will save the transplant shock later on, which is true, I also do this, but it is crucial to only feed enough for it to be dry the next day or so. If it’s not let it dry and add less water next time. As it gets bigger you increase it accordingly. I still overwater my seedlings even time to time. Cheers💨

Greetings, I'm far from being an expert, but in my opinion it might be too much food, if she is in the final media, this soil might have nutrients, plus what you are adding, I thing its too much for her. I hope it helps.

I've never used those nutrients, but my general rule of thumb is nothing but PH'd water until week 2/3. The seed has enough nutrients in it for the first week or two. I'll do a small amount of mycorrhizae but too much can damage the seedling as well.