Feel a bit of a numpty as this is basic stuff which I appear never to have learned.
I usually start my seedlings off in a covered seed tray on a south facing window sill and generally very successful. However most of them, tomatoes in particular, tend to become leggy and I usually overcome that by, when potting on, planting the invidual seedlings deeply to give them added support. Seems to work but I always feel as if I should be doing something else to stop them getting to that state. Such as removing the cover, taking them away from the light or...?
Any knowledge appreciated. Cheers