I read a more accurate version in the university of guelph magazine (parents are graduates) but couldn't find anything that accurate online. The fish is called a mangrove rivilus
Some pet stores try to feed Uromastyx spray millet, just because some people say that you can use spray millet as substrate, because IF they eat it, it wont kill them. By that logic, Petsmart would probably start keeping Rivulus on damp sphagnum moss.