Red Neon Blue-Eye Rainbow Care Guide - Aquarium Setup, Diet & Breeding

The Red Neon Blue-Eye Rainbow is a tiny, brilliantly coloured blue-eye with a slender body, oversized reflective eyes and a vivid red-orange wash across the head and front half of the body. Its translucent fins are edged and marked with dark pigment, while the males develop especially striking red, black and blue highlights when displaying.

Males are active, theatrical fish that flare their fins and perform short courtship displays to one another and to females. They are peaceful rather than aggressive, although their constant movement and fin presentation give a group plenty of character. Females are more subtly coloured and generally have a fuller body.

In the wild, this species inhabits shallow, quiet waters among submerged vegetation, leaf litter and tangled roots. The dark, tannin-stained environments where it occurs can be soft and acidic, with gentle currents and abundant cover.

Pseudomugil luminatus is one of the smallest and most colourful members of the blue-eye group. Its compact size makes it appealing for planted nano aquariums, but its social nature and delicate fry mean it is best appreciated in a carefully planned community or species aquarium.

Pseudomugil luminatus comes from the freshwater wetlands, slow-flowing streams and peat-influenced waters of Indonesia’s West Papua province on the island of New Guinea. It is associated with the Timika region and nearby lowland habitats in western New Guinea.

A group of Red Neon Blue-Eyes should have at least a 40-litre aquarium, with a footprint of roughly 60 x 30 cm or larger preferred because swimming length matters more than height. Use a mature, stable aquarium with gentle filtration, subdued flow and a secure lid, as these active fish can jump. Dense fine-leaved plants, floating cover, moss, roots and shaded areas provide confidence and spawning sites, while a dark, fine-grained substrate helps their colours stand out. Leaf litter and mildly tannin-stained water can also suit their natural habitat.

Males reach about 3.5 cm (1.4 in), while females are usually smaller at around 3 cm (1.2 in).

Offer a varied diet of appropriately sized foods, including finely crushed quality flakes, nano pellets, baby brine shrimp, daphnia, cyclops and other small frozen or live foods. Their small mouths favour several modest meals rather than large portions, and live or frozen foods are particularly useful for bringing out their colour and supporting breeding.

Red Neon Blue-Eyes can live with other peaceful, similarly tiny fish such as small rasboras, ember tetras, celestial pearl danios, clown killifish and pygmy Corydoras. Peaceful freshwater shrimp may be suitable, although newly hatched shrimplets can be eaten. Avoid large or boisterous fish, fin-nippers, bettas and predatory species, as they may intimidate, injure or consume these small rainbowfish.

Red Neon Blue-Eyes are egg scatterers that can be bred in a mature, species-focused aquarium. Provide fine-leaved plants or spawning mops, where pairs will deposit a few adhesive eggs each day. Move the mop or eggs to a separate container to prevent the adults from eating them. Incubation usually takes around 10 to 14 days, after which the tiny fry need infusoria or other very small first foods before progressing to newly hatched brine shrimp.

Males are more colourful and have larger, more elaborately extended fins, with vivid red, blue and black markings during display. Females are plainer, slightly smaller and fuller-bodied, with shorter, more rounded fins.