This is one of my red wiggler mortar bins, and it’s just a grow out bin with worms or all ages. I’ve been using electric compost as bedding lately mixed with more cardboard if it’s too dense, and the worms have been loving it. I always make sure there is no standing water, and I like to fluff it up to make sure nothing is going anaerobic. It’s a good time to check on the healthy of the worms and also make sure the bedding is in good condition for them!