lipps nailed it...Ph is critical at this young age and needs to be close to what Lipps said and stay consistent. Do not overwater as this is a common problem at a young age also as Lipps alluded to. They should nearly be dried out and wilting slightly before next watering. I wouldn't add anything other that a teaspoon of molasses (only unsulphured blackjack!) per gal. of water. It will just help the roots get the nutes already there out of the dirt easier. Good Luck!