A bit of an update here prompted by a few comments.
Facebook removed the way that they used the host sites CSS to display the comments. So what was a nice list of comments in the correct colours now is just an option of light or dark.
That's meant that our comments have been very close to the background colour.
It's not an easy fix like a checkbox or hex codes and only something that our web programmer will be able to fix, once he is back from holiday on the 15th. Don't want to risk doing it without him as there is a lot that could be broken in trying to fix something. - A lesson learnt from a previous 'easy fix'
So until then they will have to remain dark, sorry.
Also the formatting for the videos in the Community section is on the list too.