I am wondering if anyone can give me some advice I have 8 seedlings that have sprouted on 20th October and I have potted them, they are stretching and are currently about 3 inches tall and they have 4 small leaves on them, I have them in Canna Natural soil and I am not sure when to start feeding them I have bought Canna start which is for seedlings and rooted cuttings and I'm not sure when they can go under my big light which is a 600. Can anyone give me some advice please as I don't want them to die?