I will echo what the others have said. Mine lived in a q-tank for several weeks and took to food the first time I tried. He eats anything I put in the tank, mostly Mysis, small pellets and even Nori. It was by far one of my best recent additions, truely a cool little fish. Very active, non-aggressive, eats well, fun to watch, etc.
You absolutely do need a sand bed for them to bury themselves in. Mine sleeps in the sand every night.
Ron