i believe that you have a low rh% and maybe overwater the first days, this is important and might stunt your grown cause, in the seedling stage (first week) the seedling is up taking the water from the moister of the ambient and trying to develop a root system so if you don't give the proper conditions (<70%rh and not more than 100-150 ml of water only 1 time and far from the seedling) she not gonna develop the root system and get a slow start. Also i notice a stretch seedling, this is cause you got the light to far away or/and a weak light.
Try to go low in fertilization at least the first week (only root juice) then the next weeks feed only 1/4 of the dosage recommend for photos, so 0.3-0.5 biogrow, up the dosage gradually depend on the response of the plant. Happy growing mate, keep it up π