
The Hemigrammus Rhodostomus fish, also known as the Threadfin Acara, is a popular freshwater aquarium fish.
They are native to the blackwater streams and rivers of South America, specifically in the Amazon and Orinoco river basins.
This species is relatively small, reaching a maximum length of about 2.5 inches.
In the wild, they are found in areas with dense vegetation and slow-moving water.
Setting Up an Aquarium for Rummy Nose Tetras
Rummy nose tetras are active schooling fish that prefer a longer tank to swim back and forth, so a 20-gallon tank or bigger is more suitable.
The water in their natural environment is very soft and acidic, but they can do well in pH levels of 5.5–7.5 with soft to moderately hard GH.
A planted aquarium with lots of greenery is a great way to showcase their red and silver colors, and a darker background and substrate can make them stand out even more.
They get along with any peaceful community fish that are similar-sized, such as other tetras, rasboras, and corydoras.
To see their special swimming behavior, get at least 8–12 tetras, as six is the typical number suggested for a school of fish.
Water and Environment
The Rummy Nose Tetra is a delicate creature that requires specific water conditions to thrive. Temperature should be maintained between 76-80°F (24-27°C).
Their water pH needs to be slightly acidic, ranging from 5.5-7.0, as anything alkaline can cause their colours to fade.
To replicate their natural habitat, it's essential to use soft, sandy substrates in the aquarium, just like the blackwater regions of the Rio Orinoco and the lower Amazon Basin.
These fish are accustomed to living in areas with rocks, caves, and dense vegetation, which provide ample shade and food sources.
Incorporating elements like driftwood and leaves into the aquarium can help to simulate the tea-coloured waters they're adapted to.
Maintaining optimal water quality and conditions is crucial for their health and vibrancy, so it's worth investing in a good water filtration system.
Rummy Nose Tetra
Rummy nose tetras are active schooling fish that thrive in warmer waters between 74–84°F (23–29°C) and prefer a longer tank to swim back and forth, making a 20-gallon tank or bigger more suitable.
They are omnivores that love to chase down community fish food, making them great test subjects for new foods in a tank.
Rummy nose tetras can do well in pH levels of 5.5–7.5 with soft to moderately hard GH, and their care requirements are similar to other tetras from the Amazon basin.
They are great community fish that get along with peaceful species like other tetras, rasboras, and corydoras, and their bold personality makes them perfect dither fish for shy or territorial fish.
To bring out their rosy blush, offer foods that contain naturally color-enhancing ingredients like krill or salmon.
You'll want to feed them smaller foods that fit in their small mouths, such as baby brine shrimp, nano pellets, and daphnia.
Their ideal diet is a variety of different options to avoid potential nutrient deficiencies.
Here are some recommended foods for rummy nose tetras:
- Baby brine shrimp
- Nano pellets
- Daphnia
- Xtreme Krill Flakes (for their rosy blush)
- Easy Fry and Small Fish Food (with salmon for color enhancement)
Rummy nose tetras can be a bit finicky, but with the right care and diet, they'll thrive in your tank.
They're a great choice for anyone looking to add some excitement and color to their community tank.
As one owner noted, "when one moves, they all move" – it's truly a sight to behold!
Care and Behaviour
Hemigrammus rhodostomus, also known as the rummy-nose tetra, is a peaceful species that thrives in the company of other calm fish.
They do best with tankmates that are similar in size and temperament, such as other South American species, pencil fish, and small Loricariids.
In a community tank, they get along well with smaller rasboras, barbs, and West African dwarf cichlids.
To see their unique swimming behavior, keep them in a group of at least 10, preferably more, as they are one of the more tightly shoaling small tetras.
Their striking appearance is enhanced when maintained in a school, making them a great addition to a community tank.
Rummy Nose Tetras Diet
Rummy nose tetras are omnivores that love to eat community fish food, and they'll even swim around the tank to chase it down.
They thrive on smaller foods that fit in their small mouths, such as baby brine shrimp, nano pellets, and daphnia.
To bring out their rosy blush, offer fish foods that contain naturally color-enhancing ingredients, like krill in Xtreme Krill Flakes and salmon in Easy Fry and Small Fish Food.
The key is to provide a variety of different options to avoid potential nutrient deficiencies in their diet.
Behaviour and Compatibility

Rummy noses are a peaceful species that won't compete well with boisterous or larger tankmates.
They thrive in the company of other South American species, such as Hemigrammus, Hyphessobrycon, and Corydoras.
In a community tank, they can get along with smaller rasboras, barbs, and West African dwarf cichlids like Pelvicachromis species.
It's essential to keep them in a group of at least 10, preferably more, as they are one of the more tightly shoaling small tetras.
Keeping them in insufficient numbers can lead to stress and poor health.
They actually look more effective when maintained in a shoal, so it's worth the extra effort to get a larger group.
Quick Facts and Introduction
The Rummy Nose Tetra is a popular choice among aquarists, and for good reason. They're known for their striking appearance and tranquil demeanor, making them a great addition to any freshwater aquarium.
Their vibrant red snouts and silver bodies are a sight to behold, and they're relatively easy to care for. With proper conditions, they can thrive in an aquarium environment that replicates their natural habitat.
Here are some key facts about the Rummy Nose Tetra:
To keep your Rummy Nose Tetras happy and healthy, it's essential to provide them with optimal conditions. This includes abundant vegetation, subdued lighting, and a dark substrate. They also prefer to be kept in groups of eight or more, as their schooling behavior becomes more pronounced and visually appealing in larger numbers.
Frequently Asked Questions
What temperature do red nose tetras like?
Red nose tetras prefer warm water temperatures between 24 to 31 °C (75 to 88 °F). They may require even warmer temperatures, up to 33 °C (91 °F), for breeding.
What is the lifespan of a rummy nose?
A rummy nose tetra's average lifespan is 3-5 years with proper care. Proper care can significantly impact their lifespan.
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