how or how often can i feed my tort a prickly pear???and when i do feed them do i peel them for em or can he eat the little prickly stuff on them too??cause i know there kinda sweet so would it be like a snack???oh yeah and vitamins to dust the food with what would you guys recommend???like i know repashy makes an all in one cause thats what i dust my chameleons feeders with instead of rotating every week...thanks...oh yeah and can i feed it the cactus that it grows on???