Can red tail sharks live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Red tail sharks and dwarf neon rainbowfish make a good pair. Both are fine at 75–79°F. Plan on at least 55 gal.

Red tail sharkRed tail shark72–79°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: 75–79°Red tail shark 72–79°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Red tail shark 6.5–7.5Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Red tail shark · 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

Red tail sharkDwarf neon rainbowfish
Temperature72–79 °F75–82 °F
pH6.5–7.56.5–7.5
Adult size5.0 in2.5 in
Minimum tank55 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomMiddle
GroupOne per tankGroups of 6+
DietOmnivoreOmnivore

Better tank mates for red tail sharks

All red tail shark tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can red tail sharks live with dwarf neon rainbowfish?

Yes. Red tail sharks and dwarf neon rainbowfish make a good pair. Both are fine at 75–79°F. Plan on at least 55 gal.

What temperature suits both red tail sharks and dwarf neon rainbowfish?

75–79 °F. Red tail sharks need 72–79 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do red tail sharks and dwarf neon rainbowfish need together?

At least 55 gal, set by the red tail shark. Add space for each extra fish.