NO, when they are that young they are self sufficient they really just need water. If you feed them now you may kill them. If you were to do anything I would maybe water twice as much as the container they are in, but you would run the risk of making them waterlogged. I would just let them do their thing, and see how it goes. If you mess with them too much it can stress them out. When you say 12 days are you counting from when they popped up or when you first got the seeds wet? And how close are the lights to the plants? :karma Cloud: