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Fish Freshwater Care: medium Semi-aggressive

Sun Loach

Yasuhikotakia eos
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Other names: Botia eos
Group: Loaches and bottom dwellers · Family: Botiidae · Origin: Southeast Asia — Mekong basin (Laos, Cambodia, Thailand) and southern Vietnam (Dong Nai)

An 11 cm botia with a metallic yellow to reddish-brown body and a large dark spot on the caudal peduncle. It fights over territory; it needs a spacious aquarium with plenty of hiding places and a large group.

Will it suit my tank?

Last updated October 16, 2026

Temperature
24–28°C
pH
6–7.5
Hardness
2–12 dGH
Adult size
11 cm
Minimum tank size
150 liters
Social structure
School
Group
at least 5, ideally 8+
Swimming zone
Bottom
Diet
Omnivore
Breeding
Other

Water parameters

Temperature24–28°C
pH6–7.5
General hardness (GH)2–12 dGH
Recommended range
May escape, needs a lid Eats shrimp Eats snails Suitable for planted tanks

Overview

October 16, 2026 · Suggest an edit

The sun loach is recognized by its body, which ranges between metallic yellow and reddish brown, and the large dark spot on both sides of the caudal peduncle. Adults reach 10–11 cm. Breeding males have been reported to turn navy blue, with the edge of the dorsal fin turning red. It is known as one of the toughest-tempered members of the genus; when space and shelters are scarce it defends its territory fiercely.

Tank Setup

October 16, 2026 · Suggest an edit
  • At least 150 liters and 120 cm of length for a group of 5–6.
  • 24–28°C, pH 6–7.5; well-oxygenated water, moderate flow.
  • Many caves and a stone-and-root layout that breaks lines of sight reduce fighting.
  • A tight lid is essential; it jumps.

Diet

October 16, 2026 · Suggest an edit

An omnivore leaning toward meaty foods. Offer sinking granules, frozen bloodworms, brine shrimp, tubifex and blanched vegetables or fruit. It may nibble soft plants; it hunts snails.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

In a large group the aggression is spread among themselves; when kept in small numbers it may bully other fish.

Good companions: robust, fast medium-sized fish: barbs, devarios, large danios, botias of similar temperament.

Avoid: snails, shrimp, slow and long-finned species, small aquariums.

A short profile for this species

The Sun 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