They are pretty sweet, and having like 2 species in a 55g wouldbe really nice; then all I'd need is like a small school of top dwellers and im set
p.s. @ Spartan: Are bichirs peaceful towards other bichirs of same species?
In general, they can coexist. Sometimes they do snap at each other, but it causes no damage. Be careful with their tankmates though. I know of someone who had a 15 inch bichir eat a 10 inch gar. Boy, was the owner surprised and ticked that his beloved gar was eaten. He said the gar was bent in half in the stomach of the bichir making it look pregnant. Many things, even if it doesn't fit in their mouths, will get eaten. In a 55g i would recommend a P. senegal and P. delhezi (IMO the best looking). There are many small species (around 1 foot length) out there, some harder to find than others.
This is IMO the best site to get bichir information
http://aquaticpredators.com/forums/index.php?showforum=42
Heres a good look at some of the awesome species there are.
http://aquaticpredators.com/forums/index.php?showtopic=643