I think you are getting the hang of that plant dude, next watering might be a good time to repot into limed soil, i pestle and mortar my lime down to a fine powder to make it faster acting. As you said it looks like it has passed, give it more time and light feeds, repot at next watering. Think you have learned somthing, did you lime the soil the seedling was in? How much lime? Wouldn't an investment of some cal/mag help you out? I would water around the seedling not the whole pot, allow the water to soak down around the roots but not saturate the pot. More pics of the second seedling please and that other plant looks like it just needs to do some growing now. Peace