Callichthyidaefreshwater fishintermediate

Scleromystax macropterus

Scleromystax macropterus

Also known as: Scleromystax macropterus, Longfin Cory

Origin: South America

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Water Parameters

Temperature1824 °C
15 °C35 °C
pH67.5
49
GH (Hardness)215 °dGH
0 °dGH30 °dGH
KH (Alkalinity)18 °dKH
0 °dKH20 °dKH

Quick Stats

Max Size
9 cm
Min Tank
120 L
Lifespan
8-12
Swimming Level
bottom
Schooling
Yes (4–8+)
Diet
omnivore
Temperament
peaceful but males competitive

About

Scleromystax macropterus is a sizeable armoured catfish from the Paraná-Paraguay river system featuring notably elongated dorsal and pectoral fin spines that give it an imposing profile. Its bold body markings and large size make it a centrepiece species. Like other Scleromystax, it prefers cooler, well-oxygenated water and a spacious setup.

Care Guide

Water: 18–24°C, pH 6.0–7.5, soft to medium hardness; requires excellent water quality. Tank: 120L+, fine sand substrate, strong flow and filtration, robust decor. Feeding: Sinking wafers, pellets, frozen bloodworm, earthworm, and tubifex. Behaviour: Peaceful schooling species; males can interact competitively; keep with more females. Compatibility: Best with cool-water species; avoid small, delicate tankmates.

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