Sandfish as we call them are the best. We had one with the worst MBD I've ever seen (rescue) and he lived for about 6 months or so. He was a good specimine for educating the public about why not to feed certain foods to animals. He was very personable came out of his sand at dawn and dusk, would wait for his crickets every day. A great character!
We personally do not recommend feeding these guys dog or cat foods as they do not have the full nutritional requirements. But everyone is different.
Ours loved his bugs.
Anyhow there's my rant
thanks
Rusty