Hello! i am wondering what are good tankmates for a Black Ghost Knife and a Elephant Nosed Knife in a 75 Gallon, i believe a 75 Gallon is a nice size for a few knives and it is the biggest size i can get, so can anyone give me suggestions for tankmates in a 75 gallon? i was wondering if any Synodontis catfish, talking catfish, and a pictus catfish are compatible with BGK and ENK, and i want to know which medium sized fish are compatible with BGK and ENK, thanks!