Black Phantom Tetra

Found in schools, around patches of submerged tree roots or vegetation, over sluggish backwaters, of lakes and ponds.
South America - Guaporé River and Upper Paraguay River basins

Popular aquarium fish!
Related to Piranha's.
Piranha's have a fearsome reputation (because of James bond 007) as a voracious predator that can strip flesh off bones in minutes, although they have razor sharp teeth they are in fact quite timid scavengers.