The only real way to know would be to try it. All fish have different personalities but like the other member stated it worked for him but he has a much bigger tank. Do any other cichlids interest you besides gt ?So I take that it's better to keep the bichir with less aggressive tank mate yes? As long as they're being enough to avoid getting eaten? And one more thing, how are angel fish with bichirs?
Polys are addicting man. Gonna be tough to keep just one lol. I dont think the polys would bother the angels at all that would look like a cool tank i never though about keeping angels with polys