Can bichirs live with plecos?

Verdict
Yes

Yes. Bichirs and plecos make a good pair. Both are fine at 72–82°F. Plan on at least 125 gal.

BichirBichir72–82°F · pH 6.5–7.5 Common plecoCommon pleco72–86°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–82°Bichir 72–82°Common pleco 72–86°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Bichir 6.5–7.5Common pleco 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Bichir · 12 inCommon pleco · 15 in0"2"4"6"8"10"12"14"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

BichirCommon pleco
Temperature72–82 °F72–86 °F
pH6.5–7.56.5–7.5
Adult size12.0 in15.0 in
Minimum tank75 gal125 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomBottom
GroupAlone or in pairsAlone or in pairs
DietCarnivoreHerbivore

Better tank mates for bichirs

All bichir tank mates

Better tank mates for plecos

All common pleco tank mates

Questions

Can bichirs live with plecos?

Yes. Bichirs and plecos make a good pair. Both are fine at 72–82°F. Plan on at least 125 gal.

What temperature suits both bichirs and plecos?

72–82 °F. Bichirs need 72–82 °F, plecos need 72–86 °F.

What size tank do bichirs and plecos need together?

At least 125 gal, set by the common pleco. Add space for each extra fish.