You could do African butterfly fish, African brown knives, maybe Elephantnose fish, and maybe even some larger African tetras (depending on the size/species of bichir). Basically any African riverine fish that wont pick on or get eaten by your bichir.
It depends on what biotope you wish to mimic but heres some swamp/river
FISH:
African tetras, Mormyrids,African Knifefish, African Butterfly fish,
Synodontis, Hemichromis, Pelvicachromis,barbs, spiny eels, Haplochromines, Tilapia
o nothin im just pointin out that some fish that ppl raise here is often a food source in other countries. like phiranna, red-tail catfish, tilapia, an peacock bass to name a few. didnt mean to cause a up-stir.