Firstly you want to find some proper seedling mix. Seedlingss do not need any nutrient or any other crap in the mix to kick them off.
Secondly, choose a grow container that matches the size of your plants, in other words do not use a rather large pot to grow seedlings in. A 1 inch pot would be suffice, 2 inch max. This keeps the seedling mix fresh as the seedling can actually use up the moisture in the pot which then allows your plant to dry out the media temporarily, and you to water it again regularly. Whereas a large pot for seedlings means the seedling sits in the same media with the same moisture retained and going stale, which in turn can lead to all sorts of problems.