Pseudogastromyzon fangi – Fang’s Hillstream Loach (5–6 cm)

The Fang’s Hillstream Loach (Pseudogastromyzon fangi) is a unique and attractive freshwater loach native to fast-flowing mountain streams in China. It features a flattened body, sucker-like mouth, and intricate patterns along its body that help it blend seamlessly with rocks in its natural habitat. This species is highly prized in the aquarium hobby for its distinctive appearance and algae-grazing behavior, making it an excellent addition to river-style planted aquariums.

Size

• Adult length: ~5–6 cm (2–2.4 inches).

• Flattened, elongated body designed for bottom-dwelling in strong currents.

Behavior & Social Needs

• Peaceful and shy, especially around larger or aggressive fish.

• Best kept in small groups of 3–5 to encourage natural behavior while allowing individual territories.

• Compatible with small, non-aggressive species such as rasboras, small tetras, dwarf shrimp, and other hillstream loaches. Avoid aggressive or boisterous tankmates.

Tank Conditions

• Minimum tank size: 20–30 gallons for a small group.

• Temperature: 72–78°F (22–26°C).

• pH: 6.5–7.5, slightly acidic to neutral preferred.

• Setup suggestions: Strong water flow and high oxygenation with smooth rocks, driftwood, and hiding spots. Fine sand or gravel substrate allows natural grazing and movement.

Diet

• Omnivorous, primarily grazers.

• Feeds on algae, biofilm, and specialized sinking wafers or pellets for hillstream loaches.

• Can be supplemented with blanched vegetables (spinach, zucchini) and occasional small live/frozen foods like daphnia.

• Continuous grazing is essential for healthy growth and vibrant coloration.

Lifespan & Hardiness

• Hardy under stable, oxygen-rich conditions with strong water flow.

• Sensitive to poor water quality and stagnant environments.

• Average lifespan: 4–6 years in captivity.