You’ve selected your seeds, you’ve invested in unfamiliar seed starting equipment, you’ve planted the seeds — and now they're coming up! What to do?!
Lesson One: Take it easy. Remember that seeds are just like any other embryo, and that their parents have bestowed upon them a supply of food to get them started. As seeds germinate, they use this food to unfurl their first leaf/leaves, and to pop out a tiny, rudimentary root with which to take in water and nutrients. As those first leaves unfurl, the plants will begin taking energy from the sun through photosynthesis. My approach is to lay off all fertilizers until it’s time to transplant them into their permanent growing spots. Seedlings just don’t need a lot of food. They need bright light and a steady, but moderate supply of water.