Hey I'm new but I wanted to let you know that my cham also decided coco fiber was a good place to dig despite me making a lay bin with ReptiSoil for her. What I did since she liked the coco fiber was place it on top of the substrate, so she could still dig in that but had the actual good stuff beneath it. She ended up laying eggs fine. Just a heads up! But I've literally only done this for her first time laying so feel free to ignore my advice or if other keepers dismiss it I'm fine with that.