don't feel bad or anything but that will never work even if they get along i'd say the aba aba would out grow and eat the fahaka we'll mabye it might not fit they do call them puffers fora reason but both fish are very aggressive would would fight plus they like differnt water types also
They come from the same natural habitats... that being said, just don't do it. Not a good combination by a long stretch. Maybe if you have an enormous enormous public aquarium sized display you could go for it, but otherwise no. Even then, aba's can easily exceed 4 feet whereas most fahakas fall shy of 20 inches...
really i didn't know that fahakas were from africa i all ways thought they were from south america or asia hmmm learn something new every day i suppose