Similar to Manderin gobies, it's good to find one that has been in captivity for a while and is eating prepared foods. They can be picky eaters, but are so worth trying to find a good one, a real cool fish.
I was going to get one about 2 hours ago but didn't. Its mouth looks like the manderin's that's why I'm worry about feeding it. I don't have enough pods in my small tank if that's all it eats.