My tomato seedlings have bolted and are looking a bit leggy and this has happened repeatedly over the last few years. I always thought it was because I was planting them early and the days were short. After looking at this website linked below I have now realised that I have been overwatering them and not using vermiculite, so not letting enough air in to the roots.
http://www.tomatogrowing.co.uk/html/tomato_growing_tips.htmlThere are some good tips on this website, but this hasn't really been a problem in the past, not a major one anyway, because when I pot them on I always bury them up to the first leaves and the roots develop from the buried stem. Now I always thought that you could do the same thing with peppers and chillis, but this youtube link below that I watched today says that chillis don't like stem rooting and that when you prick them out you should pot them on at the same level that they germinated at.
http://www.youtube.com/watch?v=qWFA55vmxX8You live and learn. Anyway this was perfect timing for me as I have pricked out my toms and chillis today to pot them on in 3" pots. I just thought I would share these links as they are top info imho.
This guy on youtube owns a production nursery and he really knows his chillis!! Good stuff!