Blue Tit Nest Box

Hi, we have a nest box camera and today had the wonderful sight of 4 fledglings leaving the box.  Mum and Dad have done a great job!  There is a “runt” still in the box (perhaps a day away or so from fledging too).  There is also a small dead chick in the next which has remained for 36 hours or so. Should I open the box and remove it?  Mum/Dad appear to be occasionally returning to the remaining chick but I am concerned about flies etc being attracted by the dead chick?  Any thoughts or guidance would be welcomed.  Many thanks