Seedlings yellowing and curled

Not all seeds are meant to be, you will never get 100% perfect germination. The plant in picture 2 looks ok, it will grow soon enough. It always pays to plant some spare seeds, more than you intend growing, for situations just like this. That way you can pick only the healthiest specimens to grow. I usually plant, if I have them, 2-6 seeds for each strain I want to grow and then pick only the best example to continue with. While this may seem wasteful, I do not want to waste 3-6 months growing sub standard seedlings. This way you keep the seed distributors in business and are always only planting fresh seeds with the best chance of germination. I learnt a long time ago that pinning all your hopes on a single seeds can lead to disappointment. Obviously if you only have one seed there is little choice, but I prefer to have a minimum of 2 seeds for each strain I want to grow, well before starting the next crop cycle. It is the "6 Ps" principle - Prior Planning Prevents Piss Poor Performance. Hope this helps, Organoman.