Danio choprae (Glowlight Danio)

Overview

The Glowlight Danio, scientifically known as Danio choprae (and formerly classified under Celestichthys), is a micro-predator and schooling fish highly prized in the aquarium hobby. Despite its small size, it boasts an incredibly vibrant coloration that almost appears to glow, hence its common name. This fish is incredibly hardy, making it an excellent choice for both beginner and experienced aquarists looking to add a splash of color and non-stop activity to a planted community tank.

Distribution and Habitat

Endemic to northern Myanmar, specifically the Irrawaddy River drainage in Kachin State, the Glowlight Danio is typically found in small, clear, and highly oxygenated gravel-bottomed streams. These natural habitats are often shaded by dense forest canopies and feature moderate water flow with plenty of rocky structures and submerged vegetation.

Description of Glowlight Danio

Body shape:

They possess a slender, streamlined, and torpedo-like body shape that is characteristic of the Danio genus, perfectly adapted for swift swimming in flowing waters.

Color:

The base coloration is a yellowish-green to silver, overlaid with a brilliant, neon-orange to red longitudinal stripe running down the lateral line. They also feature distinct, dark vertical bars along their flanks, giving them a tiger-like appearance.

Barbels:

Like many cyprinids, they possess small, sensory barbels around their mouth to help locate food, though these are quite short and difficult to see without magnification.

Snout:

The snout is slightly pointed with a terminal mouth, angled slightly upward to facilitate feeding on small insects and larvae in the water column and at the surface.

Eyes:

They have relatively large, alert eyes with a golden or silvery rim, aiding in their visually-oriented hunting of micro-prey.

Fins:

The fins are mostly translucent but are beautifully accented with yellow, orange, or red bands, particularly on the dorsal and anal fins.

The Tail:

The caudal (tail) fin is deeply forked, providing the agility and speed necessary for their highly active lifestyle, often featuring subtle colorful margins.

Temper

This species is entirely peaceful and poses no threat to other tank mates. However, their hyperactive swimming can sometimes stress very shy or slow-moving fish.

Sociality

Glowlight Danios are obligate schooling fish. They must be kept in groups of at least 8 to 10 individuals. In larger groups, they establish a natural pecking order, feel much more secure, and display their most intense, vibrant colors.

Activity

They are exceptionally active and are in near-constant motion. They primarily occupy the middle and upper levels of the aquarium, darting back and forth in playful chases with one another.

Keeping and Caring for Glowlight Danio

Tank size:

Despite their small adult size of only 3 cm, their high activity level means they require a tank of at least 60 liters (15 gallons) to provide adequate swimming space. A longer tank footprint is highly recommended.

Water Parameters:

Temperature

They prefer slightly cooler water than many tropical fish, thriving in temperatures between 16-24°C (60-75°F).

pH

The ideal pH range is slightly acidic to neutral, between 6.0 and 7.5.

Hardness

They are adaptable but do best in soft to moderately hard water, ranging from 2 to 15 dGH.

Ammonia, Nitrite, Nitrate

Ammonia and Nitrite must always be at 0 ppm. Nitrates should be kept as low as possible, ideally below 20 ppm, through regular water changes.

Lighting

Moderate lighting is preferred. If the lighting is very bright, floating plants can be used to diffuse the light and make the fish feel more secure.

Water flow

Originating from hill streams, they appreciate a moderate to moderately strong water flow. A powerhead or a strong filter return can simulate their natural environment.

Decorations and Plants

A heavily planted aquarium with dark substrate will make their neon colors pop. Provide dense background and midground plants, driftwood, and smooth river stones, while leaving a wide-open swimming area in the center of the tank.

Diet

In the wild, they are micro-predators feeding on small insects, worms, and zooplankton. In the aquarium, they are unfussy omnivores. They will readily accept high-quality crushed flakes and micro-pellets. To maintain their best health and coloration, their diet should be supplemented with small live or frozen foods such as Daphnia, baby brine shrimp (Artemia), and Cyclops.

Some Feeding Tips

Because they have small mouths, ensure all prepared foods are ground down to an appropriate size. Feed them small amounts 1 to 2 times daily, only offering what they can completely consume in under two minutes.

Breeding

Glowlight Danios are egg-scatterers that show no parental care. To breed them, set up a separate, dimly lit breeding tank with a mesh bottom or a thick layer of Java Moss where the non-adhesive eggs can fall out of the parents' reach. Condition a pair or a small group with live foods, and introduce them to the breeding tank. Spawning usually occurs in the early morning. Once eggs are spotted, remove the adult fish immediately, or they will eat their own eggs. The fry will hatch in 2-3 days and require infusoria or liquid fry food until they are large enough to accept baby brine shrimp.

Conclusion

The Glowlight Danio (Danio choprae) is an incredibly rewarding fish to keep. Their striking neon coloration, hardiness, and energetic schooling behavior make them a lively centerpiece for any planted aquarium. As long as they are provided with clean, well-oxygenated water and a group of their own kind, they will thrive and bring endless fascination to your aquascape.