I am having slight issue with new growth on 4 day ...

I agree @Stick, like always the soil is the key for succesfull growing. Using a lightmix is the better opinion for the seeds. If they get less nutes, they show up. if they get to much they suffer and probably die. Its a common mistake taken the wrong soil .transplant her the next days (very gently). For my automatic plants iam doing a livehack. i fill the pot with the full-prefertilised soil (for example biobizz allmix) then i dig ahole about 8 cm radius and 20 cm deep and fill in the biobizz-lightmix. so the small seedling is not overnuked, and the elderly plant get a good prefertilised soil.Happy growing. you can see it in my Dark Devil Diary