Can bristlenose plecos live with black neon tetras?

Verdict
Yes

Yes. Bristlenose plecos and black neon tetras make a good pair. Both are fine at 73–81°F. Plan on at least 30 gal.

Bristlenose plecoBristlenose pleco73–81°F · pH 6.5–7.5 Black neon tetraBlack neon tetra73–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–81°Bristlenose pleco 73–81°Black neon tetra 73–81°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Bristlenose pleco 6.5–7.5Black neon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Bristlenose pleco · 5 inBlack neon tetra · 1.5 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

Bristlenose plecoBlack neon tetra
Temperature73–81 °F73–81 °F
pH6.5–7.55.5–7.5
Adult size5.0 in1.5 in
Minimum tank30 gal15 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietHerbivoreOmnivore

Better tank mates for bristlenose plecos

All bristlenose pleco tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can bristlenose plecos live with black neon tetras?

Yes. Bristlenose plecos and black neon tetras make a good pair. Both are fine at 73–81°F. Plan on at least 30 gal.

What temperature suits both bristlenose plecos and black neon tetras?

73–81 °F. Bristlenose plecos need 73–81 °F, black neon tetras need 73–81 °F.

What size tank do bristlenose plecos and black neon tetras need together?

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