Your moisture mat is just there to encourage your worms to work in the surface of the waste and as it is biodegradable the worms will eventually eat it.
Assuming you are adding your food scraps every couple of days as you lift the moisture mat you will see the worms working just below the surface.
The main thing to ensure your worms work well for you is to feed them regularly with kitchen scraps. Usually adding waste every couple of days is the most efficient way of ensuring they are working. They don’t like a glut of waste, and underfeeding means you won’t get them working to their optimum level.
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There are a few types of mite that love a worm composting kit and this is all normal and part of the ecosystem. However, as with most things if they start to take over the kit this can become a problem. There are two main types – a reddish brown mite and a white shiny round mite. Both are tiny and if numbers become huge they eat the food and your worms will tend to burrow deeper into the kit and this in turn stops the worms from reproducing as effectively.