Can red tail sharks live with paradise fish?

Verdict
Yes

Yes. Red tail sharks and paradise fish make a good pair. Both are fine at 72–79°F. Plan on at least 55 gal.

Red tail sharkRed tail shark72–79°F · pH 6.5–7.5 Paradise fishParadise fish61–79°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Red tail shark 72–79°Paradise fish 61–79°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Red tail shark 6.5–7.5Paradise fish 6–8
The green band is the pH both tolerate.

Size to scale

Red tail shark · 5 inParadise fish · 3.5 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 sharkParadise fish
Temperature72–79 °F61–79 °F
pH6.5–7.56–8
Adult size5.0 in3.5 in
Minimum tank55 gal20 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atBottomTop
GroupOne per tankOne per tank
DietOmnivoreOmnivore

Better tank mates for red tail sharks

All red tail shark tank mates

Better tank mates for paradise fish

All paradise fish tank mates

Questions

Can red tail sharks live with paradise fish?

Yes. Red tail sharks and paradise fish make a good pair. Both are fine at 72–79°F. Plan on at least 55 gal.

What temperature suits both red tail sharks and paradise fish?

72–79 °F. Red tail sharks need 72–79 °F, paradise fish need 61–79 °F.

What size tank do red tail sharks and paradise fish need together?

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