Glowlight Danio

The glowlight danio is one of the smallest members of the danio group, reaching only 25–30 mm, yet it packs remarkable colour into its tiny frame. The body is a warm golden-bronze overlaid with an orange or pinkish horizontal stripe that seems to glow under suitable lighting — hence the common name — and the dorsal and caudal fins are marked with bright yellow and black accents. Endemic to the Mogaung Chaung river system in Kachin State, northern Myanmar, this species inhabits small, rocky hill streams with clear, well-oxygenated water. It has been reclassified by some authorities as Celestichthys choprae, but remains widely traded under Danio choprae. Commercial breeding has made it consistently available in the hobby.

The glowlight danio is an active, peaceful shoaler that must be kept in groups of six or more, where males constantly display to each other, intensifying their already vivid colours. An 80 × 30 cm footprint, equating to approximately 72 litres, is recommended for this active species, as they use every inch of swimming space in the mid-to-upper water column. They look particularly effective in a heavily planted aquarium with a dark substrate, where their glowing colours contrast beautifully, though they also adapt well to a river-style setup with rounded rocks and gentle current. Water temperature should be maintained at 16–26°C, and while field data records neutral to slightly alkaline pH at 7.6, the species adapts well to pH 6.5–7.5 in captivity. A tight-fitting cover is essential as danios are accomplished jumpers.

In nature, glowlight danios feed on small insects and zooplankton. They readily accept quality micro-pellets, flake foods, and small live or frozen offerings like daphnia, brine shrimp, and mosquito larvae. Their peaceful nature and tiny size make them ideal nano-community fish, compatible with other small cyprinids, dwarf rasboras, small tetras, and shrimp. They are reliable egg-scatterers among fine-leaved plants, and the fry are straightforward to raise on infusoria and microworms. With stable water quality and a varied diet, they can live for three to four years, bringing a subtle but brilliant glow to any planted nano aquarium.