15 Best Fish For Small Tank Without Heater

15 Best Fish For Small Tank Without Heater

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Basic guides of keeping fish in a nano tank without heater

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Generally tropical fish can't thrive in water, temperature below 16°C

Breeding pair always need heaters

Some fish can live under 16°C. However, they can be lethargic.

A constant temperature range is more preferable than cooler or warmer temp .

01. Cloud Mountain Minnow

01. Cloud Mountain Minnow

Technically they can live in cold water well. However, for better habitat keep temp between 18–22 °C

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02. Betta

02. Betta

Betta is a tropical fish. Now if the water temperature remains more than 22°C then they don't need heaters.

The nano tanks are very suitable for betta fish.

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03. Cherry Shrimp

03. Cherry Shrimp

Cherry shrimp can live easily in a nano tank without a heater. However, the water temp should be a minimum of 18°C

They need a heater during the breeding period.

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04. Amano Shrimp

04. Amano Shrimp

For a room, which has a temperature minimum of 20°C is fine to keep amano shrimp without heaters.

Like cherry shrimp, amano shrimp need heaters during the breeding season.

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05. Guppies

05. Guppies

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Guppies are purely tropical fish & technically need a heater along unless the water temp remains more than 16°C

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06. Clown Killifish

06. Clown Killifish

Clown Killifish is an amazing fish for a nano tank that doesn't need a heater.

They can live in coldwater as well as warm water too. However, the best temp range should be 18° - 26° C

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07. Hillstream Loach

07. Hillstream Loach

They can live in coldwater.  Hillstream loach needs oxygen-rich water & cold water contains high DO.

Temperature more than 16°C  is suitable for them.

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08. Celestial Pearl Danio

08. Celestial Pearl Danio

Celestial Pearl Danio can thrive at room temperature and doesn't require a heater.

However, the water temp should not be less than 18°C

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09. Mystery Snail

09. Mystery Snail

Mystery snails don't need a heater to be healthy. They can accept a wide range of temp.

Mystery snails need oxygen-rich water & cold water contains high DO.

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10. Platies

10. Platies

Platy fish can live in cold-water tanks until or unless the water temperature is kept consistent.

Regular water changes help platies to be healthy.

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11. Endler’s Livebearer

11. Endler’s Livebearer

Endler’s Livebearer is just like guppies. They don't need a heater until the water temp crosses limits.

22 to 26 °C is the range to keep Endler's livebearer healthy.

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12. Mollies

12. Mollies

Mollies can live without heaters if the place is situated in a tropical area. Otherwise too much coldwater is bad for mollies especially black molly

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13. Rainbow Shiner

13. Rainbow Shiner

Rainbow Shiner can live without a heater in a tank. They can tolerate a wide range of temp.

11 to 21 °C is the suitable temp range for rainbow shiner fish.

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To Know About 15 Most Popular Freshwater Aquarium FishClick The Link Below