Can bristlenose plecos live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Bristlenose plecos and dwarf neon rainbowfish make a good pair. Both are fine at 75–81°F. Plan on at least 30 gal.

Bristlenose plecoBristlenose pleco73–81°F · pH 6.5–7.5 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

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

Size to scale

Bristlenose pleco · 5 inDwarf neon rainbowfish · 2.5 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 plecoDwarf neon rainbowfish
Temperature73–81 °F75–82 °F
pH6.5–7.56.5–7.5
Adult size5.0 in2.5 in
Minimum tank30 gal20 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 dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can bristlenose plecos live with dwarf neon rainbowfish?

Yes. Bristlenose plecos and dwarf neon rainbowfish make a good pair. Both are fine at 75–81°F. Plan on at least 30 gal.

What temperature suits both bristlenose plecos and dwarf neon rainbowfish?

75–81 °F. Bristlenose plecos need 73–81 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do bristlenose plecos and dwarf neon rainbowfish need together?

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