Am I the only one hearing you say you have raised chicks at this time of year before, using this SAME setup, and this SAME lamp, more than once, with NO LOSSES? Yet everyone seems to be telling you that your problem is that your tote is too small, the sides are too tall, and you overheated your chicks, etc. If what I am hearing you say is correct, that nothing in your setup is different, and you have raised chicks this way successfully in the past, then there HAS to be another reason your chicks died, in my opinion, and this is not your fault. I don't know the answer, but there has to be something other than your setup.