Emperor tetra care
Nematobrycon palmeri · Atrato and San Juan river basins, Colombia
Emperor tetras have a broad black stripe, blue-green eyes in males and a three-pointed tail.
- Tank size
- 20 US gal or larger
- Temperature
- 73 to 81 °F (23 to 27 °C)
- Group size
- 6 or more
- Temperament
- Peaceful
- Adult size
- 2 in
- pH
- 6 to 7.5
- Hardness (GH)
- 3 to 12 dGH
- Lifespan
- 4 to 6 years
- Diet
- Omnivore
- Care level
- Easy
In a 20 gallon long
30¼ × 12½ × 12¾ in outsideHow to keep emperor tetras
Emperor tetras have a broad black stripe, blue-green eyes in males and a three-pointed tail. A group of six with more females than males suits a planted 20 gallon or larger tank.
Diet: Omnivore: flakes, micro pellets, frozen foods. Fish food types compared · how often to feed.
Where they swim: Middle of the tank.
Emperor tetra tank mates
Share the temperature and water, and neither side eats, nips or bullies the other. Check the full group in the stocking checker.
Zebra danio
2 in · 10+ gal · 64–77 °F
Honey gourami
2 in · 10+ gal · 72–82 °F
Panda corydoras
2 in · 15+ gal · 68–77 °F
Otocinclus
2 in · 20+ gal · 72–79 °F
Forktail blue-eye rainbowfish
2 in · 10+ gal · 72–80 °F
Amano shrimp
2 in · 10+ gal · 68–80 °F
Ghost shrimp
2 in · 5+ gal · 65–80 °F
Mystery snail
2 in · 10+ gal · 68–82 °F
Keep apart
White cloud mountain minnow: No shared temperature: emperor tetras need 73 to 81 °F, white cloud mountain minnows 64 to 72 °F.
Pea puffer: Pea puffers belong in a tank of their own.
Convict cichlid: Convict cichlids are aggressive towards peaceful fish such as emperor tetras.
Jewel cichlid: Jewel cichlids are aggressive towards peaceful fish such as emperor tetras.
Saulosi cichlid: Saulosi cichlids belong with other Lake Malawi cichlids, not with emperor tetras.
Red-tail dwarf puffer: Red-tail dwarf puffers belong in a tank of their own.
What an emperor tetra tank needs
A tank of 20 US gallons or more (such as the 20 gallon long) with a cover, and the equipment below.
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Aquarium Co-Op Easy Flow Sponge Filter, Small
A sponge filter gives gentle flow and cannot pull in small fish. It runs from an air pump, with airline tubing and a check valve, all sold separately.
Aqueon PRO QuietFlow Power Filter 10
Rated by the maker for up to 20 US gal, which covers a 20 gallon emperor tetra tank without being built for a far bigger one.
Aqueon QuietFlow Internal Power Filter 15–30 gal
Rated by the maker for 15–30 US gal, which covers a 20 gallon emperor tetra tank without being built for a far bigger one.
hygger Precise Aquarium Heater 100W
Emperor tetras need 73 to 81 °F; most homes run cooler, so a heater holds the temperature.
API Freshwater Master Test Kit
Tests ammonia, nitrite, nitrate and pH, the readings that matter most before and after adding emperor tetras.
Seachem Prime 100 mL
Removes chlorine and chloramine from tap water at every water change.
Fluval Edge Thermometer
Shows the water temperature at a glance, so you know it stays within 73 to 81 °F.
More choices, each with the reason it is in or out: Filters for a 20 gallon tank · Heaters for a 20 gallon tank. We don’t list fish food: any good brand of the foods under Diet will do. Plan the whole tank's equipment →
Common emperor tetra problems
- Males spar; more females spreads the attention.
Test the water first whenever fish look unwell: see what your readings mean, then match the symptom. For disease, a vet who treats fish can diagnose it and advise treatment.
More to compare
Sources
Name, origin and adult size checked against Wikipedia: Nematobrycon palmeri. Temperature, pH, hardness, group size, lifespan and minimum tank size are common hobby guidance, not figures from that article. Ranges are the range the species tolerates; aim for the middle. Minimum tank sizes are for an adult group. Drawings are our own; photo credits follow.
Photo credits
Real photographs from Wikimedia Commons, resized and cropped to fit; each is used under the license named.
- Emperor tetra 7TP (Krzysztof Bartosik), CC BY-SA 4.0, via Wikimedia Commons
- Zebra danio Roundish, CC0, via Wikimedia Commons
- Honey gourami Antoon Dommerholt (Dutch Wikipedia), CC BY-SA 3.0, via Wikimedia Commons
- Panda corydoras Chronotopian, CC BY-SA 3.0, via Wikimedia Commons
- Otocinclus CHUCAO, CC BY-SA 3.0, via Wikimedia Commons
- Forktail blue-eye rainbowfish Dirk Godlinski, CC BY-SA 3.0, via Wikimedia Commons
- Amano shrimp Stefanie Leuker, CC0, via Wikimedia Commons
- Ghost shrimp Smithsonian Environmental Research Center, CC BY 2.0, via Wikimedia Commons
- Mystery snail Gabriel Resende Veiga, CC BY-SA 4.0, via Wikimedia Commons
- White cloud mountain minnow Petrtyl, CC BY 4.0, via Wikimedia Commons
- Pea puffer Beta Mahatvaraj, CC BY-SA 4.0, via Wikimedia Commons
- Convict cichlid S. Olkowicz, CC BY 2.5, via Wikimedia Commons
- Jewel cichlid NasserHalaweh, CC BY-SA 4.0, via Wikimedia Commons
- Saulosi cichlid Gerard Delany, CC BY-SA 2.5, via Wikimedia Commons
- Red-tail dwarf puffer Neale Monks (English Wikipedia), CC BY-SA 3.0, via Wikimedia Commons
- Neon tetra Holger Krisp, CC BY 3.0, via Wikimedia Commons
- Cardinal tetra CHUCAO, CC BY-SA 3.0, via Wikimedia Commons
- Black neon tetra Debivort, CC BY-SA 3.0, via Wikimedia Commons
- Green neon tetra Sascha Biedermann, CC BY-SA 2.5, via Wikimedia Commons
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