I would need a pic to be certain but the fish normally imported as Jaguar candiru is a benthic insectivore and a member of the genus Trichomycterus.
When I obtained them, I could not get a formal ID on them (without locality these can be tough) and of the 4 that I had it appeared to be two species. These fish are not parasites and fed mostly on bloodworms, brine, blackworms and mysis in captivity. They would take some sinking pellets. They are very easy to keep and are quite interesting fish. Only thing I would caution about them is to not do very heavy water changes on them as this really ticks them off. They also do best and are most active in groups rather then singly. These fish are more backwater and flooded plain species then the majority of other trichomycterids, so provide cover in the form of driftwood, leaves and plants.
Edit: Just a note on the common name Candiru. This is used for all of these fish parasitic or not (as well as cetopsis) and is sort of like the common usage of Minnow here in the states to describe any number of Cyprinids. Not all are closely related at all...