The Lambchop Rasbora (Trigonostigma espei), often celebrated for its brilliant copper-orange body and distinct dark lambchop-shaped marking, is a peaceful and striking shoaling fish. Native to the slow-moving forest streams and blackwater habitats of Southeast Asia, it brings a warm, glowing aesthetic to planted freshwater aquariums.

Note for Beginner Aquarists: Trigonostigma espei is an exceptionally hardy, gentle, and beginner-friendly fish, provided it is kept in a properly cycled aquarium alongside a true social group of its own kind.

Short Description & Highlights

Trigonostigma espei grows to a modest length of roughly 1.2 inches, making it a perfect addition to nano and community setups. It is distinguished by a luminous, copper-pink body overlaid with a striking wedge-shaped black patch. Active and peaceful, they spend most of their time patrolling the middle and upper levels of the water column.

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Detailed Beginner Care Guide

1. Social Requirements & Schooling

Lambchop Rasboras are strictly shoaling animals that thrive in numbers. They must always be kept in a group of at least 6 to 8 individuals (though 10 or more is ideal). Keeping them isolated or in pairs causes chronic stress, fading colors, and defensive hiding. In a proper school, they display tight, mesmerizing swimming patterns.

2. Aquascape & Tank Setup

To replicate their natural Southeast Asian stream habitats, these fish look and feel best in a densely planted aquarium featuring live flora (such as Cryptocoryne, Anubias, and Java Moss). Subdued lighting, dark substrates, and the addition of botanical elements like Indian almond leaves (which release beneficial tannins) will significantly enhance their coppery coloration and overall health.

3. Feeding & Nutrition

Due to their small mouths, Trigonostigma espei requires finely sized foods. High-quality micro-pellets, finely crushed tropical flakes, and regular treats of frozen or live baby brine shrimp and daphnia will keep them energetic and brilliantly colored. Feed small portions once or twice daily.