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Fish Freshwater Care: medium Semi-aggressive

Zodiac Loach

Mesonoemacheilus triangularis
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Other names: Batik loach, Nemacheilus triangularis, Noemacheilus triangularis
Group: Loaches and bottom dwellers · Family: Nemacheilidae · Origin: South Asia — southern India, Western Ghats (Kerala and Tamil Nadu)

A colorful 6 cm stream loach with black-edged pale saddles on its back. It needs well-oxygenated, flowing water at 19–25°C; some individuals can be territorial.

Will it suit my tank?

Last updated October 16, 2026

Temperature
19–25°C
pH
6–7.5
Hardness
2–12 dGH
Adult size
6 cm
Minimum tank size
70 liters
Social structure
Colony
Group
at least 4, ideally 6+
Swimming zone
Bottom
Diet
Omnivore
Breeding
Other

Water parameters

Temperature19–25°C
pH6–7.5
General hardness (GH)2–12 dGH
Recommended range
Suitable for planted tanks

Overview

October 16, 2026 · Suggest an edit

With black-edged pale saddles along its back and similar bands on the belly side, the zodiac loach has a pattern reminiscent of batik fabric. In juveniles the bands are joined and arrowhead-shaped; with age they break up. Adults reach 5–6 cm. In the wild it lives in large groups in the flowing streams of the Western Ghats.

Tank Setup

October 16, 2026 · Suggest an edit
  • At least 70 liters and 75 cm of length for a group of 4–6.
  • 19–25°C, pH 6–7.5.
  • Flowing, well-oxygenated water; a high-capacity filter, a circulation pump or an air stone.
  • Stones, gravel and many shelters; it is sensitive to organic pollution, so a 30–50% water change every week.

Diet

October 16, 2026 · Suggest an edit

An omnivore that feeds on small insects, worms and crustaceans. It accepts dry foods, but frozen or live foods should be given regularly.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

Hobbyists' experiences differ: some groups remain peaceful while some individuals defend their territory fiercely. It is more balanced with its own kind and enough shelters.

Good companions: danios, current-loving rasboras, small barbs, sturdy small fish.

Avoid: small and timid bottom dwellers, other small loaches that would share the same territory, warm-water species.

A short profile for this species

The Zodiac Loach page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Usually compatible

Should not be kept together

Hobbyist notes

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Change history and contributors
  1. Page created · October 16, 2026