I bought two of these beautiful fish. Currently they are in a 55G quaranteen tank along with a black ghost knife that I also just bought. Trumpet Knives are aroung 7" BGK is around 4" They all seem to be getting along fine, and the trumpet knives appear to be schooling. It is hard as heck to find any data on the trumpet knifefish. Do they do well in pairs? Will they get along with the black ghost knife if kept together in the long run?