Ok listen what you need to do is just leave them alone. The plants grow by themselves. This is the number one mistake made my first time growers. They obess tooo much about trying to do what they think in common sense to be perfect for it. They don't realize that the plant uses soo little every day as a sprout. In fact they can grow in any soil laying around as long as they get light and water. So just relax don't add any fertilizer and watch them grow. When growth slows from the normal natural growth them help them along very gradual. The best gardeners are ones that are patient.