Rosy tetra

Megalamphodus rosaceus

Pink-silver body with a dark dorsal-fin patch

Mature males develop longer dorsal and anal fins. White-fin ornamental forms are not additional species.

Adult length: Up to 4 cm (standard length, without the tail fin)
Water temperature: 24–28 °C
pH: 5.5–7.5
Hardness: 1–12 dGH

Natural habitat: Native to the Essequibo, Corantijn and Suriname river basins.

Larger or domineering companions may outcompete them.

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Appearance and identification

Rosy tetras usually lack the conspicuous shoulder markings of serpae and bleeding-heart tetras. They closely resemble M. bentosi; both can show faint shoulder spots, so presence or absence of a spot is not decisive.

Same-species behaviour

Keep at least six, preferably ten or more. Males may display and compete; do not expect constant tight schooling.

Space requirements

Allow a 60 × 38 cm footprint for a small group; reassess space for a larger group or additional companions.

Diet and feeding

Offer small flakes or granules alongside suitably sized live or frozen foods.

Compatibility limits

Choose quiet companions of appropriate size and assess them individually.

Aquarium environment

Provide planted cover, shaded areas and swimming room. Bare, brightly lit surroundings may leave the fish timid and less colourful.

Sources

www.fishbase.se ↗ 2026-10-25

www.seriouslyfish.com ↗ 2026-10-22

researcharchive.calacademy.org ↗ 2026-10-22

www.aquariumglaser.de ↗ 2026-10-22

www.yuanjunshop.com.tw ↗ 2026-10-22

w.tbs-aqua.com ↗ 2026-10-22