Is it normal for you millipedes to stay underground for several days and not come up at all? I've got 2 agb's and 3 americanus. The americanus will come up only to eat and go straight back down. The agb's havent came up in almost a week. Is that normal when using coco fiber? I have read that they will eat coco fiber, is that maybe why they are not coming up to eat? They are fully grown so they shouldnt be molting? What's going on? I recently added the coco fiber to my tank, it's about a 50/50 mix of coco fiber and sphagnum-peat moss.