Golden dwarf barb

Pethia gelius

FreshwaterFish

Care at a glance

Temperature: 64–75°F (18–24°C)
pH: 6.0–7.0
Adult size: 1.6 in (4 cm)
Minimum tank: 20 gal (75 L)
Temperament: Peaceful
Social behavior: Schooling
Swim level: Middle
Difficulty: Easy
Breeding: Medium
Rarity: Common
Origin: South Asia: Ganges and Brahmaputra drainages of northern India, Nepal, and Bangladesh
Family: Cyprinidae

Overview

Keep them in a group of at least 8 to 10, in a tank of 75 liters or up. They are peaceful but timid, sitting in the middle of the water column and schooling tightly when nervous. Loners hide and lose their color, so the group matters. This is a cool-water species that does well from 18 to 24 C and arguably prefers the lower end, so a heater often is not needed in a temperate room, which makes them a good fit for an unheated coldwater community. Water should be soft and run slightly acidic to neutral, around pH 6 to 7. Feed small flakes, micro pellets, and frozen treats like daphnia or baby brine. Keep tankmates small and gentle, since boisterous or larger fish will outcompete these timid barbs at feeding time.

In the wild

Golden dwarf barbs come from slow, plant-choked stretches of the Ganges and Brahmaputra drainages across northern India, Nepal, and Bangladesh. These are cool, soft waters that run on the acidic to neutral side. To match that, give them a densely planted tank with driftwood, a soft sandy or silty substrate, and gentle flow. They settle best under subdued, dappled light, so floating plants or a few tall stems to break up the surface help a lot. A footprint of about 60 by 30 cm, roughly 75 liters, gives a small group room to school. Keep the water between 18 and 24 C with a pH of 6 to 7.

Good to know

This is a small cyprinid in the family Cyprinidae, reaching about 4 cm as a kept adult. FishBase lists a touch larger, but most care sources put it near 3.5 to 4 cm, and that is what you will see in the tank. It is an egg scatterer with no parental care, and a healthy adult lives a few years. Most fish in the trade are commercially bred.

Did you know

Despite being a barb, this fish does best in cool water and often does not want a heater at all, which is unusual in the tropical end of the hobby. Drop the temperature toward the low end of its range and a settled group tends to color up rather than slow down, the opposite of what most aquarium fish do.