
Source: Wikimedia Commons
Red nose tip and black-white tail distinctive. Most uniform schooling among tetras. Better water quality means brighter red.
The rummy-nose tetra (Hemigrammus bleheri and the closely related H. rhodostomus) is a small characin native to the Amazon and Orinoco River basins in South America. It is immediately recognizable by its bright crimson nose and boldly striped black-and-white tail fin. Growing to 4–5 cm, rummy-nose tetras are celebrated for forming the most disciplined, cohesive schools of any tetra species — groups of ten or more move in precise unison, creating a mesmerizing display in aquariums. The intensity of the red nose coloration serves as a practical water quality indicator: vibrant red signals good water conditions, while fading indicates deteriorating parameters. Slightly acidic, soft water (pH 6.0–7.0) at 24–28°C is ideal. Peaceful and compatible with virtually all small tropical fish, they accept a varied diet of fine granules, flake food, and frozen foods. Their brilliant two-tone coloring against green plantings makes them one of the most photogenic fish for aquascaping.
Origin
Amazon and Orinoco River basins, South America
Lifespan
3-5 years
Size
4-5cm
Temperature
22〜28℃
Pellets, frozen food
60cm+ for schooling
Edited & verified by: br-choku editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Primary sources
Hemigrammus rhodostomus は CITES 非該当。
Sources: Seriously Fish / CITES Appendices (Checklist)
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
10+ for beautiful schooling
Soft acidic water ideal. Water quality barometer
24-28°C
Red fades in poor water — use as water quality indicator
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Rummy Nose Tetra is 22〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Rummy Nose Tetra is 3-5 years. With proper care and nutrition, they can live a long and healthy life.
Rummy Nose Tetra typically reaches 4-5cm as an adult. Size may vary depending on care conditions and individual genetics.
Rummy Nose Tetra feeds on: Pellets, frozen food. Aim for a balanced diet with appropriate feeding frequency.
The price of Rummy Nose Tetra varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 23, 2026