I had mine for about a year in a six foot long 100g tank (had to sell him when I took the tank down). He never ate any of the food I put into the tank, instead opting to sift sand all day long and occasionally take bites out of the filamentous algae I had.
He actually did really well and grew a lot in both length and width, but MAN did he do a number on the sandbed fauna. It was easy to see they have such a bad track record; they may be the right size for a nano, but need an enormous amount of space to conduct their feeding (like a mandarin).