Hi - if you intend to keep your seedlings growing indoors on a window ledge for the time being, here is a useful tip which was passed on to me a couple of years ago. Cut a shoebox or similar in half diagonally, and line the inside completely with kitchen foil. Put the pots of seedlings in it, and place it so that the long inside back of the box faces the window. This way it reflects the light all round, and the seedlings do not become leggy, and do not bend towards the light.