Long-Fin Black Neon Tetra Care Guide: Flowing Dark Elegance

The long-fin black neon tetra is a graceful twist on a beloved classic, with trailing fins that ripple like silk through a planted tank. This long fin black neon tetra care guide from Gensou Aquascaping at 5 Everton Park, Singapore, covers everything from water conditions to creating the perfect school. Hyphessobrycon herbertaxelrodi in its standard form is already a popular community fish, but the long-fin variant adds a layer of visual elegance that few small tetras can match. At barely 4 cm, they prove that understated beauty often outshines flashy colour.

Species Profile

Black neon tetras originate from the Paraguay River basin in Brazil. The long-fin variety is a selectively bred morph with extended dorsal, anal and caudal fins. Their signature look is a horizontal iridescent green-gold stripe over a deep black band running from gill to tail. Despite the longer fins, they remain active schoolers — though their swimming pace is slightly more relaxed than the standard form.

Tank Setup

A school of eight to twelve long-fin black neons does well in a tank of 80 litres or more. They look spectacular against a dark background with dense planting — think Cryptocoryne wendtii, Java fern and moss-covered driftwood. Subdued lighting, or at least shaded areas beneath floating plants, encourages the fish to display their iridescent stripe more vividly. Gentle filtration is important; strong currents stress long-finned fish and can cause fin damage over time.

Water Parameters

Black neon tetras are adaptable, accepting a pH of 5.5-7.5 and temperatures of 22-28 °C. Singapore’s soft, slightly acidic tap water suits them beautifully with minimal adjustment — just dechlorinate with a conditioner that neutralises chloramine. Maintain GH between 2-12 and keep nitrate below 20 ppm. Their tolerance of local water conditions is one reason they are such reliable community fish here. A well-maintained planted tank with weekly 25% water changes is all they need.

Feeding

These tetras are undemanding omnivores. High-quality micro pellets or crushed flake food forms a good staple. Supplement with frozen daphnia, baby brine shrimp and cyclops two to three times a week. The long-fin variant can be slightly slower at feeding time due to its trailing finnage, so watch that faster tank mates are not outcompeting them. Spreading food across the water surface helps ensure every fish gets a share. Feed small amounts twice daily.

Schooling and Social Behaviour

Never keep fewer than six — these are obligate schooling fish that become stressed and dull when kept in small numbers. A school of ten or more creates a far more natural and visually impressive display. In a proper school, you will notice coordinated movements, gentle sparring between males and a visible hierarchy. The long trailing fins make their schooling formations particularly elegant, especially against dark substrates and lush green backgrounds.

Compatible Tank Mates

Long-fin black neons are peaceful and make excellent community fish. Pair them with similarly gentle species: Corydoras catfish, otocinclus, small rasboras, honey gouramis and cherry shrimp. Avoid notorious fin nippers like tiger barbs and serpae tetras, which will shred the elongated fins. Larger, fast-moving cichlids are also poor choices. A Southeast Asian or South American biotope community built around these tetras creates a harmonious, low-stress aquarium.

Breeding

Breeding long-fin black neons is achievable but requires some preparation. Condition pairs with high-protein foods for two weeks. Use a separate 30-litre breeding tank with soft, acidic water (pH 5.5-6.5, GH below 4) and dim lighting. A spawning mop or clump of Java moss catches the eggs. Adults will eat the eggs, so remove them after spawning. Fry hatch in about 24-36 hours and become free-swimming three days later. First foods should be infusoria or liquid fry food, graduating to baby brine shrimp after a week.

Availability and Pricing

Standard black neon tetras are widely available in Singapore for around $1-$2 each. The long-fin variant is less common and typically costs $3-$6 per fish. Check Shopee listings and specialist sellers on Carousell for the long-fin morph. Some shops in the Clementi and Thomson areas stock them periodically. Buy in groups to save on shipping and to start with a proper school — following this long fin black neon tetra care guide becomes much easier when the fish feel secure in numbers.

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