Fish that do not need a heater

These are comfortable down to 66°F (19°C) or cooler, so an indoor tank at normal room temperature suits them. If your room drops much lower in winter, they still need a heater set to the bottom of their range.

15 that fit

Zebra danio

10 gal+64–77°FpH 6.5–7.5Groups of 6+

White cloud minnow

10 gal+60–72°FpH 6.0–8.0Groups of 6+

Fancy goldfish

20 gal+65–72°FpH 7.0–8.0

Cherry shrimp

5 gal+65–80°FpH 6.5–8.0Groups of 6+

Rosy barb

29 gal+64–77°FpH 6.0–7.5Groups of 6+

Gold barb

20 gal+64–75°FpH 6.0–7.5Groups of 6+

Denison barb

55 gal+65–77°FpH 6.5–7.8Groups of 6+

Paradise fish

20 gal+61–79°FpH 6.0–8.0

Peppered corydoras

20 gal+64–77°FpH 6.0–7.5Groups of 6+

Common goldfish

75 gal+60–72°FpH 7.0–8.0

Dojo loach

55 gal+59–77°FpH 6.5–8.0Groups of 3+

Japanese rice fish

10 gal+64–75°FpH 7.0–8.0Groups of 6+

Ramshorn snail

5 gal+64–82°FpH 7.0–8.0

Ghost shrimp

5 gal+65–82°FpH 7.0–8.0Groups of 3+

Dwarf orange crayfish

10 gal+65–78°FpH 6.5–8.0

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