Is it normal for my cham be eating the substrate in her laying bin? I put in her laying bin today and as soon as she discovered the area in her house she started shootiong her tounge out at the substrate which is rinsed playsand and organic potting soil mix and eating clumps of it. I flattened the substrate out so it would'nt be so clumpy but she's still doing it. I moved her from it because I was afraid of her getting impacted but she goes right back. I've read that some reptiles eat substrate for lacking nutrients and I hope that's all it is. Should I be concerned or is this normal?