I've only had the leopard geckos for about a week, one male and one female, and I've been feeding them crickets. The problem is, they don't seem to be eating the crickets, and it appears that their tails are getting thinner. The male gecko is shedding, and I've heard they might not eat while they shed, but the female gecko doesn't seem to be eating all that much either. I've seen her attack a cricket and not eat it. They're small crickets and they seem manageable. Should I try feeding them mealworms, or do I want to get them eating crickets consistently before I give them what I've heard is considered a treat?