thats from BeBlondie a mod on MFK who is well respected an o i see as small as 30 gallons for a bichir 
Tank size
Bichirs do not need a great deal of water depth in their tanks 8 to 12 inches is actually
sufficient for any of the species.The minimum tank size for a single small species of
bichir is a tank with a footprint of 36''x12''x16'' your standard 30 gallon tank.however
bigger is almost always better so if you're looking to primaraly house bichrs listed below are
some tank sizes to consider for the smaller species.
30 gallon 36''x12''x16'' (this is the minimum size for 1 smaller species bichir)
30 gallon Breeder 36x18x12''
33 gallon Long 48x13x12
40 Gallon Breeder 36x18x16
40 gallon Long 48x13x16
50 Gallon 36x18x18
75 Gallon 48x18x20
125 Gallon 72x18x22*See note
150 Gallon 72x18x28 *See note
for the bigger species
120 Gallon 48x24x24
180 Gallon 72x24x24
The above are fairly standard sized tanks and should be available thru your local stores
*note The difference here is in the depth of the tank 6'' unless you feel the need for the
extra depth the 125 is the better/cheaper choice.
Tank size
Bichirs do not need a great deal of water depth in their tanks 8 to 12 inches is actually
sufficient for any of the species.The minimum tank size for a single small species of
bichir is a tank with a footprint of 36''x12''x16'' your standard 30 gallon tank.however
bigger is almost always better so if you're looking to primaraly house bichrs listed below are
some tank sizes to consider for the smaller species.
30 gallon 36''x12''x16'' (this is the minimum size for 1 smaller species bichir)
30 gallon Breeder 36x18x12''
33 gallon Long 48x13x12
40 Gallon Breeder 36x18x16
40 gallon Long 48x13x16
50 Gallon 36x18x18
75 Gallon 48x18x20
125 Gallon 72x18x22*See note
150 Gallon 72x18x28 *See note
for the bigger species
120 Gallon 48x24x24
180 Gallon 72x24x24
The above are fairly standard sized tanks and should be available thru your local stores
*note The difference here is in the depth of the tank 6'' unless you feel the need for the
extra depth the 125 is the better/cheaper choice.
