Hillstream Loach

Hillstream Loach Care Guide (Beaufortia kweichowensis and similar species)

Hillstream loaches are peaceful, algae-grazing bottom dwellers from fast-flowing, oxygen-rich mountain streams. Their streamlined bodies and unique fin structure let them cling to rocks in strong currents. While sometimes mistaken for freshwater stingrays or mini-plecos, their care requirements are quite specific.

Quick Overview

• Common Names: Hillstream Loach, Butterfly Loach, Hong Kong Pleco

• Scientific Names: Beaufortia kweichowensis, Sewellia lineolata, Gastromyzon spp.

• Origin: Southeast Asia and southern China

• Size: 5–7 cm

• Lifespan: 8–10 years

• Temperament: Peaceful, active, sociable with their own kind

Tank Setup

Water Parameters

️ Diet

Hillstream loaches are primarily grazers but should be supplemented with varied foods.

• Main Foods: Algae (natural growth on rocks, tank glass)

• Supplements: Algae wafers, spirulina tablets, blanched spinach or zucchini

• Protein Treats (1–2×/week): Frozen bloodworms, brine shrimp

• Feeding Frequency: Once daily; more often if tank lacks algae

Behavior & Tank Mates

• Peaceful and active in groups

• Constantly graze surfaces with their sucker-like mouths

• Non-aggressive toward other species

Good tank mates:

• White Cloud Mountain Minnows

• Danios (Zebra, Pearl)

• Small Rasboras or Tetras

• Other cold-water, peaceful fish

• Shrimp and small snails (if compatible water)

Avoid:

• Aggressive or territorial fish

• Warm-water species (like bettas, discus)

• Slow feeders that compete poorly in strong flow

Breeding

• Rare in home aquariums, but possible under ideal conditions

• Requires cool, oxygen-rich water, hiding spaces, and clean surfaces

• Eggs are laid under rocks; fry need biofilm to feed on

• Some success reported with Sewellia lineolata in mature, undisturbed setups

✅ Summary (Metric)