Vietnam Hillstream Loach

Scientific Name: Sewellia lineolata
Common Names: Reticulated Hillstream Loach, Tiger Hillstream Loach
Origin: Central Vietnam – fast-flowing, rocky mountain streams
Adult Size: 2 to 2.5 inches (5–6.5 cm)
Lifespan: 5 to 8 years
Temperament: Peaceful, active, slightly territorial toward own kind
Swimming Zone: Bottom and glass surfaces

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Sales Description

The Vietnam Hillstream Loach (Sewellia lineolata) is one of the most eye-catching and desirable loaches in the aquarium hobby. Its intricate, maze-like reticulated pattern and unique body shape make it a standout in any setup, especially hillstream or river biotope aquariums. Adapted to fast-flowing streams, this species uses its modified pectoral fins to cling to rocks and aquarium glass, resembling a miniature freshwater stingray.

Perfect for aquarists looking to replicate natural stream environments, these loaches are peaceful, algae-grazing bottom dwellers that do best in groups. They provide non-stop activity and add striking visual interest to well-oxygenated, clean aquariums.

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Care Guide

Aquarium Setup

• Minimum Tank Size: 20 gallons (long tanks preferred for more swimming room)

• Preferred Layout: River-style or hillstream setup with smooth stones, slate, and strong current

• Substrate: Sand or fine gravel with smooth river rocks for grazing

• Décor: Rounded stones, driftwood, stacked rocks for hiding spaces

• Filtration: High turnover canister or HOB filters (6–10x tank volume per hour)

• Flow: Strong and consistent—add powerheads or directional flow pumps

• Lighting: Moderate to high; promotes algae and biofilm growth on surfaces

Water Parameters

• Temperature: 68–75°F (20–24°C)

• pH: 6.5–7.5

• Hardness: Soft to moderately hard (2–12 dGH)

• Oxygenation: Very high—surface agitation and air stones recommended

• Water Changes: 25–40% weekly; low nitrates and excellent quality are critical

Diet & Feeding

• Feeding Frequency: 1–2 times daily

• Diet Type: Omnivorous with a strong preference for algae and biofilm

• Preferred Foods:

  • Natural algae and biofilm on rocks or glass

  • Repashy (Soilent Green, SuperGreen, Bottom Scratcher)

  • Sinking wafers (spirulina, veggie-based)

  • Blanched vegetables (zucchini, spinach, kale)

  • Occasional frozen or live foods: daphnia, bloodworms (as treats)

Tip: Place flat stones near strong light to encourage natural algae growth for grazing.

Social Behavior & Compatibility

• Temperament: Peaceful with other species; mildly territorial with conspecifics

• Best Kept: In groups of 3 or more for natural behavior and confidence

• Tankmates:

  • Peaceful, current-loving species: danios, white clouds, small barbs

  • Other hillstream loaches or gobies

  • Avoid slow or sedentary species and bottom dwellers that compete for space

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Maintenance Tips

• Ensure excellent oxygenation at all times—these fish are sensitive to low O2

• Keep rocks clean but allow some algae and biofilm to grow

• Vacuum substrate regularly to avoid buildup of organics in high-flow tanks

• Acclimate slowly, especially to temperature and oxygen levels

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Available Now at Planted Aquaria

The Vietnam Hillstream Loach is a showstopping species that brings both function and beauty to your aquarium. With its peaceful nature, algae-grazing habits, and fascinating locomotive style, it’s a must-have for aquascapers and hillstream fans alike.

These loaches are happiest in clean, cool, and fast-flowing setups. Limited seasonal availability—don’t miss out.