As a permenent home I'd have to say no. As a temporary home it just depends on their current size. Should be ok if they're not that large. Also I'd say that heavily planting the tank would help curve a lot of the aggression. They could find a nice little area to chill out in if they had plants or some other type of decor to hang out in.
I've kept 6 species of Bichirs over the years (currently have 4) and the only one I found to be bully is the Ornate..just didn't mix with other species