Lambchop Rasbora

The Lambchop Rasbora (Trigonostigma espei) is a freshwater schooling fish valued for the lambchop-shaped flank mark and subtle orange-copper body tone that intensifies under planted lighting. Native to Southeast Asia (Thailand, Cambodia), this species is popular in planted community aquariums because it combines visual impact with manageable care requirements. It delivers elegant motion and warm contrast without adding aggression to the aquascape.

Appearance and Coloration

Lambchop Rasbora is known for clean pattern definition and color response that improves under stable water quality, varied feeding, and proper group size. In mature planted aquariums, the body pattern reads clearly even during fast schooling movement.

Size and Lifespan

• Adult size: 2.5 cm (1.0 inches)
• Typical lifespan: 3-5 years with stable parameters and quality diet

Ideal Aquarium Setup

This species performs best in a biologically mature aquarium that prioritizes oxygenation and stable chemistry.

• Tank size: 15 gallons (55 L)
• Temperature: 23-28 C (73-82 F)
• pH: 6.0-7.5
• Aquascape direction: branchy hardscape, stem plants, and gentle circulation

Behavior and Temperament

Lambchop Rasbora is a gentle, social species that integrates easily into peaceful planted communities. Keep groups of at least 8-12 individuals so hierarchy and movement are distributed naturally. Good companion options include small danios, ember-type tetras, corydoras, and peaceful shrimp-compatible fish.

Diet and Feeding

Lambchop Rasbora is classified here as Omnivore. Build a varied schedule with high-quality staple foods, plus frozen or live options several times per week. A rotating diet supports immunity, activity, and stronger display color.

Breeding Notes

Most cyprinids in this group are egg scatterers. Conditioning with diverse foods and offering fine-leaved plants or spawning media can improve egg survival. If breeding is the goal, move adults after spawning to reduce egg predation.

Why Keep Lambchop Rasbora in a Planted Aquarium?

Lambchop Rasbora provides movement, contrast, and schooling structure that helps a layout feel alive without overpowering the design. For aquascaping-focused community tanks, it is a practical and visually rewarding choice.