hey there bike4canna, you're not actually using soil you're using peat moss which is what is inside the light mix. it's call potting mix but it's soiless actually, comes from a non-renewable ressource and has no nutrients in it ! great for roots, not so great for the the begginer grower. why? because it has no nutes in it? am i sure? yes i am? how? made the same mistake recently lol. so what you want to do to save your seedlings is add magnesium or cal mag asap, your seedlings are showing signs of magnesium deficiency. check your ph too, peat moss has wierd ph. next time just go with normal soil. what i'm doing this time with my light mix is layering it with my soil, going soil / light mix / soil / light mix / soil / light mix seven layers light that to get the benefit of the airy light mix but none of the headache of actually growing soilless, which is what you're experiencing right now. Hope this helps bro ! good luck 🚀