You could have a few of the smaller bichirs in there. How many of them that you could keep in there would depend on factors such as the dimensions of the aquarium, filtration, aggression, etc.
i would put 2 delhezi bichirs, a red wolf fish and a Jardini arowana. my dream tank. for the people that think the red wolf is too aggresive, they aren't what u think. I have seen and experienced a large red wolf with bichirs half the size as tankmates.