Blue Emperor - Gold (Inpaichthys kerri) — 1-2cm

Overview

The Blue Emperor Tetra (Inpaichthys kerri), also known as the Gold Emperor Tetra or simply Emperor Tetra, is a shimmering, peaceful South American tetra with striking blue-and-gold coloration that shines in a planted community aquarium. Native to the upper Rio Aripuanã and Rio Madeira basin in Brazil, this species (adult size around 5.5 cm) thrives in soft, slightly acidic water and rewards aquarists with active shoaling behaviour, moderate care requirements, and stunning iridescence. Ideal for planted community aquariums.

Appearance

Inpaichthys kerri displays a slender, laterally compressed body with stunning iridescent blue on the upper body and brilliant gold or yellow on the lower flanks and belly, creating a striking two-tone effect. The finnage is accented with subtle blue and gold highlights, and males develop slightly longer finnage and more intense coloration than females. The eyes are large and expressive, and the overall appearance is both vibrant and elegant, earning this species its "Emperor" title.

Natural Habitat

This species is native to the upper Rio Aripuanã and Rio Madeira basin in Brazil, where it inhabits slow-flowing rivers, streams, and flooded forest areas. The natural environment is characterised by soft, slightly acidic water, warm temperatures, dense vegetation, submerged wood, and leaf litter. In the wild, Blue Emperor Tetras form shoals and forage among plants and debris, feeding on small invertebrates, insect larvae, and plant matter.

Aquarium Setup

Recreate a South American biotope with a planted, dimly lit aquarium featuring live plants (such as Amazon swords, Java fern, Cryptocoryne), driftwood, and open swimming areas. Use a dark sandy or fine gravel substrate to bring out coloration and reduce stress. Ensure stable water chemistry: pH 5.5–7.5, soft to moderately hard water (GH 5–10°), and a temperature of 23–28°C. A minimum of 75 litres is recommended for a proper shoal of at least 6–8 individuals. Provide gentle filtration, regular water changes, and subdued lighting to reduce stress and bring out the fish's iridescent colours.

Water Parameters

Blue Emperor Tetras thrive in soft, clean water with gentle filtration. Aim for 23–28°C, pH 5.5–7.5, and soft to moderately hard water. Conduct weekly partial water changes (20–30%) to maintain low nitrate levels and replenish essential minerals. Use a high-quality filter rated for the tank volume, and consider adding driftwood or Indian almond leaves to naturally acidify and tannin-stain the water. Monitor parameters closely, as fluctuations can stress these sensitive fish.

Feeding

In the wild, Inpaichthys kerri feeds on small invertebrates, insect larvae, and plant matter. In captivity, offer a varied small-particle diet including quality micro pellets, flakes, frozen or live daphnia, brine shrimp, and bloodworms. Supplement with occasional plant-based foods if accepted (spirulina-based flakes). Feed small portions once or twice daily. A balanced diet supports vibrant coloration, healthy growth, and active shoaling behaviour.

Behaviour

This species is peaceful and social, thriving in proper shoals of at least 6–8 individuals. Blue Emperor Tetras are active mid-to-upper water column swimmers that display lively movement and tight shoaling behaviour. They are non-aggressive and make ideal community fish, coexisting peacefully with other small, peaceful species. This species does best in a proper shoal—keeping too few can make them shy and stressed.

Tank Mates

Suitable companions include small peaceful tetras (e.g., Neon, Cardinal, Rummy-Nose), rasboras, Corydoras, Otocinclus, and peaceful small livebearers. Avoid large predatory fish, fin-nipping species, aggressive cichlids, or very boisterous tankmates. Careful planning and proper shoal sizes ensure a harmonious South American community.

Breeding

Blue Emperor Tetras spawn by scattering eggs among fine-leaved plants or spawning mops in soft, acidic water. Adults should be removed after spawning as they may eat eggs and fry. Fry require very small live foods such as infusoria or liquid fry food, graduating to newly hatched brine shrimp as they grow. Maintain excellent water quality and stable conditions to support successful breeding.

Why Buy from Tropical Fish Co

Tropical Fish Co is a leading UK specialist in South American tetras for sale, offering healthy, quarantined species including the stunning Blue Emperor Tetra. Every fish is carefully selected, acclimated to our expert holding systems, and dispatched with detailed care guidance. Whether you're building your first planted community or adding to an established aquarium, our knowledgeable team is here to support your success. Order online today for fast, reliable delivery and discover why Tropical Fish Co is the trusted choice for premium freshwater fish for sale UK.