Ok, I got the coco fiber on advice from a local reptile store (yes, I know). It's the expandable type in water. He told me to keep half of it wet and the other half dry. But then I read online about scale rot because of moist substrate and thought I'd been told wrong as often happens; that's why I let it dry out.

So the coco fiber is supposed to be wet (but not swampy, I understand)?