Can bettas live with bristlenose plecos?

Verdict
Yes

Yes. Bettas and bristlenose plecos make a good pair. Both are fine at 76–81°F. Plan on at least 30 gal.

BettaBetta76–82°F · pH 6.5–7.5 Bristlenose plecoBristlenose pleco73–81°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–81°Betta 76–82°Bristlenose pleco 73–81°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Betta 6.5–7.5Bristlenose pleco 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Betta · 2.5 inBristlenose pleco · 5 in0"1"2"3"4"5"6"
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

BettaBristlenose pleco
Temperature76–82 °F73–81 °F
pH6.5–7.56.5–7.5
Adult size2.5 in5.0 in
Minimum tank5 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atTopBottom
GroupOne per tankAlone or in pairs
DietCarnivoreHerbivore

Better tank mates for bettas

All betta tank mates

Better tank mates for bristlenose plecos

All bristlenose pleco tank mates

Questions

Can bettas live with bristlenose plecos?

Yes. Bettas and bristlenose plecos make a good pair. Both are fine at 76–81°F. Plan on at least 30 gal.

What temperature suits both bettas and bristlenose plecos?

76–81 °F. Bettas need 76–82 °F, bristlenose plecos need 73–81 °F.

What size tank do bettas and bristlenose plecos need together?

At least 30 gal, set by the bristlenose pleco. Add space for each extra fish.