Joe, don't change those pricelists yet. The polys are indeed Polypterus delhezi. Even if the pic's color is off, those are definitely upper jaw polypteridae. Endys are lower-jaw polys. The tigerfish is a hydrocynus. However, it's size and possible camera flash prevent me from IDing it as a vittatus or brevis. If there's no sign of the horizontal bands, I'd say it is a H. brevis. As it grows, it'll start to develop the horizontal bands but, they'll be much thinner than those of a vittatus. A H. vittatus should be displaying the bands even at this size.