We adopted an adult Sulcata, first time owners. Brought him home yesterday. We spent a lot of time reading ahead of time and created a great enclosure and an insulated shed with lamps for cold nights (So. CA). Brought him home yesterday. He seems great, eating, active. There is a lot mud packed in the rear of his shell. He has diahhrea. We will soak him tomorrow morning to help clear that area and see how he is. Seems fine otherwise. Is this serious?