Rummy Nose Tetra Care: Tank Setup, Feeding & Schooling

Few fish school as tightly or as beautifully as the Rummynose Tetra (Hemigrammus rhodostomus). With its bright red nose, silver body, and boldly striped black-and-white tail, a large group moving in perfect unison is one of the most impressive sights in the aquarium hobby. This rummy nose tetra care guide covers how to keep them healthy and looking their best, including suitable tankmates, feeding, and stable aquarium conditions.

Quick care overview

• Adult size: about 2 inches (5 cm)
• Minimum tank size: 20 gallons for a proper school
• Temperature: 75–82°F
• pH: 5.5–7.0
• Temperament: peaceful, schooling
• Diet: omnivore
• Lifespan: 5–6 years

The red nose is a health gauge

One of the rummynose tetra's most useful traits is that its red nose acts as a living water-quality indicator. In clean, stable, well-oxygenated water the nose glows a vivid red. If the color fades or turns pale, it is often an early sign of stress, poor water quality, or a not-fully-cycled tank. Watching their color is a handy way to catch problems early.

Tank setup

Rummynose tetras are sensitive to water quality, so they belong in a mature, fully cycled tank. Provide plenty of open swimming space in the middle of the aquarium along with planted areas for security. A well-planted aquarium with open swimming lanes, shade, and a planted backdrop helps these shy fish feel secure. Darker substrate brings out their color—browse live aquarium plants for their setup. Keep parameters stable and stay on top of maintenance; our water change guide covers the routine that keeps them thriving.

Water parameters

Their natural habitat is in South American freshwater systems with relatively soft water and sheltered areas. They do best in soft, slightly acidic to neutral water that stays warm and stable. Ideal water conditions include consistent temperature, good oxygenation, and undetectable ammonia and nitrite; test water conditions regularly rather than relying on nose color alone. Because they are less forgiving than hardier tetras, avoid adding them to a brand-new tank. Consistency matters more than hitting an exact number.

Diet and feeding

Rummynose tetras are easy to feed. A quality flake or micro-pellet works as a staple. Supplement with appropriately sized live or frozen foods, such as daphnia, small bloodworms, and brine shrimp, for variety. Baby brine shrimp are particularly useful for smaller individuals when they are appropriately sized. Alternate live or frozen offerings with a balanced staple diet rather than feeding treats exclusively. Feed small amounts once or twice daily.

Behavior and schooling

This is a species where group size truly matters. Keep at least 8–10, and larger groups of 15 or more produce the dramatic, tightly synchronized schooling this fish is famous for. In small numbers they lose color and become skittish.

Tank mates

Peaceful and social, rummynose tetras make excellent community fish. Pair them with other calm species such as small tetras and rasboras, corydoras, dwarf cichlids, and peaceful gouramis. Avoid large or aggressive tank mates. For more schooling-fish tips, see our tetra care basics and complete guide to freshwater tetras.

Is the rummynose tetra right for you?

If you have a stable, established tank and want the most impressive schooling display in the hobby, the rummynose tetra delivers. Get a big group going and enjoy the show. Find them among our freshwater fish.