I am in the process of building a tortoise table for my Russian tort. and i would like to make a little area where he could dig. I was thing using a mix of coco coir and dirt for that. I would be using coco coir everywhere else in the enclosure cause that is what i use now and like it. It is going to have live plants in it to that will be in pots so i can take them out if they need to be taken out to regrow.