Got 4 baby leopards 4 months back did great. Two weeks ago one stopped eating. And died in a week. Now another is doing same. A third was doing great. Eating etc. no issues. Dead in cage this morning. The fourth is doing fine now. Two lights including uv. Calcium. Proper foods soaked in warm water on paper towel changed daily. Have kept torts for 50 years. Never had this issue with any other species that i bought or hatched. Any ideas.