Hill Stream Loach, Butterfly Loach, or I've even 
            seen them called Stingray Plecos, live in fast moving streams where 
            the water is cool and saturated with oxygen. A tank with many hiding 
            places, smooth rocks and current are a must.
          In groups Hillstream loaches will defend, from others 
            of their species, their favorite spot by flashing their Dorsal fin 
            at one another and trying to push one another away from their area.