I finally bought spineless cactus pads from TortoiseSupply.com. They sent me two big pads. I planted the bigger one and left the other by Ariza's burrow entrance (to get her attention). She took a couple of bites and left it untouched after that. Will she grow to like it? She has in the past devoured stuff and ignored it other times. I figure she knows what she wants. She's an adult, 9 inches long.