Serpae Tetra Complete Care Guide: Hyphessobrycon eques
Serpae tetras are the deep-red outlier of the common tetra roster — beautiful when kept right, nightmarish when kept wrong. The species is notorious for shredding tankmate fins in under-sized schools, and the fix is counter-intuitive: more fish, not fewer. This serpae tetra complete care guide covers Hyphessobrycon eques from schooling mathematics through tankmate selection and the aquascape choices that keep nipping behaviour manageable. Written by the team at Gensou Aquascaping, 5 Everton Park, with over 20 years of hands-on experience.
Species Profile
Hyphessobrycon eques (also traded as jewel tetra, blood characin, callistus tetra) originates from the upper Amazon and Paraguay basins. Adult size 3.5-4 cm; deep-bodied with a brick-red to blood-red colouration, black shoulder spot, and black-and-white dorsal fin. A long-finned aquacultured variety circulates in trade. Lifespan four to five years in good conditions.
Tank Size and Schooling
Absolute minimum 90 litres for a school of ten. Below ten fish, serpae tetras turn internal aggression outward onto tankmates, chewing long fins of angelfish, gouramis and guppies. A school of twelve to fifteen redirects hierarchy displays inward among the school, greatly reducing external nipping. Tank length 75 cm minimum. This is not a species for a 60-litre nano. Browse the aquarium tanks and cabinets range for 75-90 cm options.
Water Parameters
Temperature 22-27 degrees Celsius, pH 5.5-7.5, GH 2-12, KH 0-8. More tolerant than many tetras of harder water, which makes them a good match for community tanks that cannot hit strict blackwater parameters. Singapore tap water post-dechlorination is well within range. Nitrate under 25 mg/L. An aquasoil substrate helps hold pH in the lower band this species prefers but is not essential.
Tank Setup
Dark substrate, moderately planted with backgrounds of stems and midground crypts, one or two driftwood pieces for territorial breakup. Serpae tetras appreciate clearly defined swimming zones with visual obstacles between regions — a tank that lets the school see the entire volume from any angle encourages restless cruising and aggression toward tank edges. Source substrate from the decoration and substrate range.
Planting Plan
Background stems (Hygrophila polysperma, Ludwigia, Rotala), midground crypts, anubias and java fern on the driftwood. Dense planting actually reduces aggression because the school loses sightline to potential targets. Leave open swimming zones at the front and mid-water of the tank. Visit the live plants range for stem plant options.
Filtration and Flow
Canister filter at 4-5x tank volume per hour. Serpae tetras are moderately active swimmers that appreciate flowing water — a spray bar on the rear glass distributing current forward works well. Prefilter sponge on the intake. Browse the filtration range for canister options suited to 90-120 litre tanks.
Feeding and Aggression Management
A consistently well-fed serpae school is a visibly calmer school. Feed twice daily, generous pinches of micro pellets and flake supplemented by frozen bloodworm, brine shrimp and daphnia three times a week. Hungry serpae channel energy into nipping. Spread food across the tank to avoid concentration around a single feeding spot. Pick up varied foods from the fish food and feeding range.
Tank Mates to Choose and Avoid
Safe: corydoras (any species), bristlenose pleco, otocinclus, similar-sized barbs, rosy tetras, giant danios, rainbowfish. Avoid: angelfish, gouramis, bettas, guppies, mollies, platys — any fish with long flowing fins. Even a well-managed serpae school occasionally takes a pass at a trailing fin. Same tank-length, same activity level, short-finned companions are the working formula.
Breeding
Egg-scatterers in soft acidic water. A 30-litre breeding tank with fine-leaved plants or spawning mop, dim lighting and a conditioned pair fed bloodworm for a fortnight will spawn in 48 hours. Remove adults immediately. Fry hatch at 24-36 hours, free-swim at day four, feed on infusoria and microworm. Moderately easy to breed compared to most tetras — a satisfying project for intermediate hobbyists.
Sourcing in Singapore
Serpae tetras appear regularly at C328 Clementi, Iwarna and Seaview at SGD 1.50-2.50 each for standard, SGD 3-4 for long-fin variants. Stock arrives from Indonesian and Thai farms in good condition generally. Ring shops before visiting — stock rotates fortnightly, and when they are in, buy the whole school at once rather than in two trips, since adding new fish to an established serpae group can trigger a week of territorial aggression.
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