Black Ghost Knifefish

 
Minimum Tank Size: 150 gallons
Care Level: Moderate
Temperament: Semi-aggressive
Water Conditions: 73-80°F, KH 0-10, pH 6.5-7.0
Maximum size: 1 ft. 6 in.
Diet: Carnivore
Compatibility: Compatibility not found.  :'(   (Though it is a given, don't pair with any type of Tetras)
Origin: South America
Notes: The Black Ghost Knifefish needs a well filtered aquarium to keep healthy. This fish needs a big aquarium to grow to maximum capacity. Will accept most fish foods, though it prefers live or frozen foods

Picture: http://www.bestchicagoaquariumsfreshsaltwatertropicalfishsupplies.com/
Info: http://www.liveaquaria.com/product/prod_display.cfm?c=830+836+857&pcatid=857