Well my new enclosure is about done. I am just waiting for the plants to take root and the ground to harden. The problem is everytime I put my torts in their huge new pen all they want to do is eat rocks and dirt. WHY?! They get calcium. There are weeds and grass they can munch on and a lot of exploring to do, but no...they would rather eat rocks and dirt and anything they shouldn't. HELP! Advice PLEASE!