Hi Ben
Mouldy food is good, rotten food is bad.
A couple of months is not a long time to have a wormery -
The worms will still be eating the coir block and getting established
Its not only the worms that eat the food but the bacterias etc that help break it down.
It takes time, a wormery is a complete ecosystem that takes time to establish, also we are entering the quiet period where the worms go quiet
Leave the mouldy food, but dont add more untill it started to go.
Instructions can be downloaded here
http://www.wormcity.co.uk/wormfaq.htm#instructions
Ronnie