Rummy Nose Tetra (Petitella rhodostoma)

The Rummy Nose Tetra is a classic South American schooling tetra with a bright red face, silver body and bold black-and-white tail pattern. It is one of the best aquarium fish for showing how healthy a planted community is: when water is clean and stable, the red nose is vivid; when the fish is stressed, the colour quickly fades.

Petra supplies this captive-bred stock as Hemigrammus rhodostomus CB. Current taxonomy commonly places the true rummy nose tetra as Petitella rhodostoma, with Hemigrammus rhodostomus retained here as the supplier and trade synonym customers still recognise. This listing is for the true rummy nose type, not the brilliant/firehead rummy nose or the false rummy nose, which are close relatives that can look very similar in shops.

Why Aquarists Love Rummy Nose Tetras

A proper shoal of Rummy Nose Tetras gives a planted aquarium movement without aggression. They tend to swim together more tightly than many common tetras, especially in a longer tank with open midwater space. The red head, clear body and striped tail create a clean, high-contrast look against dark wood, green plants and tannin-tinted water.

The colour is also useful. A dull nose is not a decoration problem; it is often a sign to check water quality, recent stress, temperature, oxygenation or bullying. That makes this species a favourite with aquarists who enjoy reading fish behaviour rather than just looking at colour.

Correct Identity and Similar Species

Rummy nose naming can be confusing because several related species are sold under similar common names. FishBase currently lists the true Rummy Nose Tetra as Petitella rhodostoma, and aquarium references still commonly use the older name Hemigrammus rhodostomus. The `CB` in the supplier name means captive-bred.

The brilliant rummy nose, often seen as Petitella bleheri or the old Hemigrammus bleheri, usually has red extending further back over the head and gill area. The false rummy nose, Petitella georgiae, has a different tail and body pattern. These fish share similar care, but keeping the identity honest avoids overpromising exact wild locality or appearance.

Aquarium Size and Group Size

Keep Rummy Nose Tetras in a group. Six is an absolute starting point, but a group of 10 or more is far better because it brings out the tight schooling behaviour people buy this fish for. In a small group they can look nervous, pale and scattered; in a larger group they move with much more confidence.

For long-term care, use a mature aquarium of at least 80 litres, with a longer footprint preferred. A 90 cm tank or larger gives the shoal room to turn and move naturally. They are small fish, but they are active midwater swimmers and should not be treated like static nano fish.

Water Conditions

Petra's stock range is 23-26 C, pH 6.0-7.2 and 2-10 dGH. Aim for stable warm freshwater, gentle to moderate flow and excellent oxygenation. They are much happier in mature aquariums than in brand new setups, and they show stress quickly if ammonia, nitrite, nitrate, pH swings or temperature changes are allowed to drift.

Soft to moderately soft water suits them best. You do not need to chase extreme blackwater conditions for captive-bred stock, but avoid hard alkaline extremes and sudden corrections. A dark background, natural wood, leaf litter used carefully, floating shade and healthy plants all help them settle and colour up.

Planted Tank Setup

This species looks superb in planted aquariums. Use a darker substrate, driftwood, shaded back corners and open swimming space along the front or centre. Tall stem plants, floating plants and broad-leaved plants all work, but leave a visible route for the shoal to move as a group.

Good filtration matters more than strong current. Rummy Nose Tetras appreciate clean, moving water, but they should not be blasted around the aquarium. Keep maintenance regular and gentle. Large sudden water changes with mismatched temperature or chemistry can cause the colour to drop and the group to tighten nervously.

Feeding

Feed small foods that match their mouth size. Fine tropical flakes, micro pellets and small granules make a good staple. Add small frozen foods such as cyclops, daphnia, brine shrimp and finely chopped bloodworm for variety. They usually feed in the midwater, so sinking foods should be balanced with foods that stay suspended long enough for the shoal to eat.

Several small feeds are better than one heavy feed. Rummy Nose Tetras are active but not pushy, so avoid keeping them with large or boisterous fish that take every bite first. Good food and low stress are the easiest way to keep the red nose bright.

Tank Mates

Choose peaceful tank mates that enjoy similar warm, soft-to-neutral water. Good choices include peaceful South American tetras, pencilfish, small Corydoras in suitable soft-water setups, dwarf cichlids chosen carefully, hatchetfish and other calm planted-tank species. A larger group of Rummy Nose Tetras often looks better than mixing too many tiny shoals.

Avoid fin nippers, aggressive cichlids, very large fish, boisterous barbs and anything that needs hard alkaline water. Shrimp may be safe as adults in a mature planted tank, but tiny shrimplets can be eaten. If you are comparing peaceful schooling fish, you may also like Congo Tetra, Cardinal Tetra or Neon Tetra.

Health and Settling

On arrival, keep the lights low and give the shoal quiet time to settle. The red colour may be reduced after transport; this is normal if it improves as the fish acclimate. Watch for steady schooling, clear eyes, intact fins, even breathing and active feeding.

If the nose stays pale, test the water before assuming disease. Check ammonia, nitrite, nitrate, temperature, pH stability, oxygenation and tank mate pressure. These fish are famous for showing stress early, which is one reason careful aquarists value them.

Best Buyer Fit

Choose Rummy Nose Tetras if you want a peaceful, elegant schooling fish for a mature planted community aquarium. They are especially good for aquascapes where movement, group behaviour and subtle colour matter as much as individual showiness.

Skip them for brand new aquariums, rough communities or hard-water setups. They are not difficult once settled, but they reward preparation and consistency. A prepared group in clean water is far more impressive than a few nervous individuals in a busy tank.

Setup Checklist Before Ordering

• Confirm the aquarium is mature and fully cycled.
• Plan for a group of 10 or more where possible.
• Keep temperature stable around 23-26 C.
• Use soft to moderately soft water, ideally within pH 6.0-7.2.
• Provide plants, shaded cover and open swimming space.
• Choose peaceful tank mates that will not outcompete the shoal.
• Have fine prepared foods and small frozen foods ready.

Ordering and Arrival

This listing covers captive-bred Rummy Nose Tetra size variants supplied through Petra, with availability depending on the current stock list. Eligible livestock is packed carefully and sent by UK live-animal courier. The Live Arrival Guarantee applies when the receiving and acclimation instructions are followed. Use WELCOME10 if you are placing your first order and the code is currently available at checkout.

After arrival, acclimate slowly, keep the lights low and let the shoal settle before judging final colour. Once comfortable, a healthy group should move together, feed confidently and show the bright red face that makes this tetra so popular.