Rummy Nose Tetra Care Guide: The Living Water Quality Indicator

The Rummy Nose Tetra (Hemigrammus rhodostomus) is famous for two things: its striking appearance — a vivid crimson head, silver body, and boldly striped black-and-white tail — and its almost paranormal ability to school in perfect synchrony. When kept in groups of twenty or more, Rummy Nose Tetras move as a single unit through the aquarium, turning, accelerating, and stopping together in a display that never ceases to amaze.

Water Parameters

Rummy Nose Tetras are native to the soft, warm, acidic rivers of South America. They are more demanding than Neon Tetras:

• Temperature: 24–28°C
• pH: 5.5–7.0 (they do best in soft, slightly acidic water)
• Hardness: Soft to moderately soft (2–8 dGH)
• Nitrate: Below 20 ppm — elevated nitrate causes the vivid red nose colour to fade, which is the origin of their "water quality indicator" reputation

A faded red nose on your Rummy Nose Tetras is a reliable early warning sign that water quality has degraded. Test your water and perform a water change immediately.

Tank Setup

• Minimum tank size: 80 liters — these are active, open-water swimmers that need space
• Current: They appreciate gentle to moderate water flow — a well-positioned filter return creates the current they enjoy swimming against
• Plants: A densely planted background with open midwater swimming space is ideal

Feeding

Rummy Nose Tetras are omnivores:

• Hikari Micro Pellets: An excellent sinking micro pellet sized appropriately for tetras.
• TetraMin Tropical Flakes: A reliable staple.
• Frozen daphnia, brine shrimp, and bloodworms: Essential for vibrant colour and conditioning for breeding.

Feed once or twice daily. Avoid overfeeding — Rummy Nose Tetras are particularly sensitive to elevated nitrate from uneaten food.

School Size

A school of six is the minimum, but Rummy Nose Tetras truly shine in groups of fifteen or more. The larger the school, the tighter and more synchronised the schooling behaviour becomes. In a 120-liter planted tank with a school of twenty, the effect is mesmerising.

Health and Longevity

Healthy Rummy Nose Tetras live 5–6 years with proper care. The intensity of the red nose colouration is a direct proxy for health and water quality — bright, vivid red means excellent conditions; pale or white nose means water quality issues or stress. Monitor this visual cue and act promptly when you notice fading.