This morning I opened the lid to quite a suprise!
Close up of the mass of whatever.
Using a small nail I “sliced” open one of the masses, gooie inside.
5 minutes later it seems to be bleeding.
It’s only growing on top newspaper bedding. I have found it in the leaf and cardboard mixed bedding too.
I removed all of the newspaper and any signs of the yellow growth. Old carpet will be used to cover the top until I can tell what’s going on.