Okaaaay, I dug up an earthworm and gave it a wash. Offered it with forceps and he came over quite willingly and seemed interested, but he just doesn't seem hungry. Perhaps it's due to breeding season. He's perky enough, but just doesn't seem to be bothered about the food. I'll give it another few days and try again with a scented pinkie. It wouldn't bother me to buy feeder guppies, but nobody will sell them if you asked for them. I'll just have to try a variety of foods and see how it goes. I'd be worried if he was just lying coiled up, but he's whizzing around his viv and looking for ways out at the moment.