Blue Tail Hillstream Loach

Scientific Name: Gastromyzon ornaticauda
Common Names: Blue Tail Hillstream Loach, Blue Tail Borneo Loach
Origin: Clear, fast-flowing hillstreams of Borneo
Adult Size: 1.5 to 2 inches (4–5 cm)
Lifespan: 5 to 8 years
Temperament: Peaceful, social, active grazer
Swimming Zone: Bottom-dwelling with occasional mid-level activity

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Description

The Blue Tail Hillstream Loach (Gastromyzon ornaticauda) is a visually striking nano fish with a flattened, ray-like body and a shimmering blue tail that sets it apart from other river loaches. Native to the oxygen-rich, fast-flowing streams of Borneo, this species thrives in aquariums that simulate its natural environment with strong flow, cooler temperatures, and biofilm-covered surfaces.

Perfect for peaceful community aquariums and river-style aquascapes, this loach is known for its unique movement, daytime activity, and algae-grazing behavior. When kept in groups, G. ornaticauda shows more natural behaviors, from gliding across rocks to social feeding interactions.

A must-have for aquarists interested in biotope aquariums or those looking to add rare, functional beauty to their setups.

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Care Guide

Aquarium Requirements

• Minimum Tank Size: 20 gallons (long layout preferred)

• Tank Style: River-style or hillstream layout with directional current

• Filtration: High turnover (6–10x per hour) with strong flow; sponge pre-filters recommended

• Substrate: Smooth sand or fine gravel

• Décor: Rounded river stones, slate, driftwood, and large surface areas for grazing

• Lighting: Moderate to bright; encourages growth of natural biofilm and algae

Water Conditions

• Temperature: 68–76°F (20–24°C)

• pH: 6.5–7.5

• GH/KH: Soft to moderately hard water

• Oxygenation: Very high; use air stones, powerheads, and surface agitation

• Water Clarity: Crystal clear preferred; these loaches are sensitive to poor water quality

Feeding & Diet

• Feeding Frequency: Once or twice daily

• Diet Type: Omnivorous grazer; primarily biofilm and algae, but will take supplements

• Recommended Foods:

  • Algae wafers and spirulina-based sinking pellets

  • Repashy gel foods like Soilent Green or Super Green

  • Blanched vegetables (zucchini, spinach)

  • Live or frozen foods: baby brine shrimp, cyclops, daphnia

  • Naturally occurring biofilm on rocks and driftwood

Tip: Let algae and biofilm grow on hardscape—this is an essential food source and enriches natural behavior.

Social Behavior

• Temperament: Peaceful and shy when alone, more confident in groups

• Best Kept In: Groups of 3–6+ individuals

• Compatible Tankmates:

  • White Cloud Mountain Minnows

  • Small danios and rasboras

  • Other hillstream loaches (non-aggressive species)

  • Shrimp and small snails (depending on tank setup)

• Avoid: Large or aggressive fish, bottom-dominant species, or warm-water community tanks

Maintenance

• Weekly water changes (30–50%) are essential for maintaining oxygen and cleanliness

• Rinse sponge filters in tank water to avoid killing beneficial bacteria

• Keep flow consistent—sudden drop in current can cause stress or loss of oxygen

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Available Now at Planted Aquaria

Bring motion, color, and utility to your aquascape with the Blue Tail Hillstream Loach—a functional algae grazer with the elegance of a miniature stingray and the temperament of a model citizen. Whether you’re creating a hillstream biotope or looking for an unusual nano fish, this species is both beautiful and beneficial.

Now available at www.plantedaquaria.ca. Limited stock due to rarity and seasonal availability.