Photo provided by Jeremias @herpmias
You may be looking at this white cottony stuff and thinking, what is this mold that’s growing in my pet’s home, and why aren’t my isopods doing their job and breaking it down? The answer is simple; it isn’t mold at all.
This white fluffy stuff is called mycelium. It is the vegetative part of a fungus. Isopods won’t really care for eating it, but they will work their way around it as much as possible to get to the fungus underneath.
What will break them down however, are springtails. They’ll have a hard time eating it in its “cottony” state, but if you spray it down with water, it will flatten into the substrate, making it easier for the springtails to break it down.