Here's my take on the optimum tank set up. Different people have different opinions but this is what has always worked for me:
1) I like a tank with a medium-grained substrate.....I generally use standard aquarium gravel which is attractive and reasonably-priced.
2) I always use driftwood and/or rocks to provide some structure to the tank and to give the bichirs a place to get out of the direct overhead light. I find that bichirs seem to fare better when they have a hiding place where they can feel secure.
3) I always use plants in my bichir tanks, either real (most of the time) or artificial or a combination of both. Keep in mind that standard aquarium fluorescent lights will put you in the low-light category (<2 watts per gallon) so select your plants accordingly should you choose to incorporate live ones. I'm partial to Water Sprite, Java Fern,
Anubias species,
Cryptocoryne species and some
Aponogeton species....most of which will do reasonably well under low light.
Regarding tank-mates...I keep various species of fish with my bichirs including Bush Fish (
Ctenopoma and
Microctenopoma species), African Knife Fish (
Xenomystus nigri), African Featherfin Knife (
Papyrocranus afer), African Butterfly Fish (
Pantodon buchholzi), African Mud Fish (
Phractolaemus ansorgei, Congo Tetras (
Phenacogrammus interruptus), Dwarf Giraffe Catfish (
Anaspidoglanis sp. and various types of
Synodontis cats. Of course, I do tailor the size of the tank-mate to the size of the bichirs in the tank to prevent the tank-mates from being appetizers for the Polypterids. As you can tell, I stick to other West African fish as tank-mates for my bichirs but you could certainly add equivalent types of fish from other continents. I don't agree with kentobismol's comment that you shouldn't add any surface-dwelling fish. My African Butterfly Fish get along quite nicely with my younger bichirs and I have kept them with adult specimens of the 'smaller' bichir species very successfully.
-Joe
Here are some shots of some of my bichir tanks:
10 Gallon Grow-Out
Standard aquarium gravel, PetsMart fake driftwood, plants are all live: water sprite, Java fern,
Aponogeton boivianus
20 Gallon (Long) Grow-Out
Eco-Complete substrate, PetsMart fake driftwood, plants are all live: water sprite,
Vallisneria spiralis,
Anubias sp.
100 Gallon
Standard aquarium gravel, multiple pieces of real driftwood and petrefied wood, plants are a mixture of artificial (left side) and real:
Aponogeton crispus,
Bolbitis sp.,
Anubias sp.