Moonlight gourami - Trichogaster microlepis

Scientific name: Trichogaster microlepis

Common name: Moonlight gourami

Family: Osphronemidae

Usual size in fish tanks: 10 - 13 cm (3.94 - 5.12 inch)

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Recommended pH range for the species: 6 - 7

Recommended water hardness (dGH): 4 - 18°N (71.43 - 321.43ppm)

0°C 32°F30°C 86°F

Recommended temperature: 26 - 30 °C (78.8 - 86°F)

The way how these fish reproduce: Spawning

Where the species comes from: East Asia

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Middle levels

Food and Feeding

The Moonlight Gourami (Trichogaster microlepis) eats a variety of foods, thriving on a balanced diet. They readily accept flakes and pellets but should also be offered live or frozen foods like brine shrimp, bloodworms, and daphnia to stay healthy and maintain their vibrant colors. Feed them small amounts 2-3 times daily, ensuring they get food in community tanks, as their timid nature may stop them from competing with bolder fish. Including a weekly fasting day promotes digestive health and keeps water quality high.

Origin

The Moonlight Gourami comes from Southeast Asia, specifically the calm waters of Thailand and Cambodia. These habitats have warm, soft, slightly acidic water with dense vegetation, which provides shelter and breeding areas.

Sexing

Distinguishing male and female Trichogaster microlepis is straightforward. Males have reddish to orange pelvic fins and a longer, pointed dorsal fin. Females, by contrast, have yellowish pelvic fins and a more rounded dorsal fin, especially outside breeding periods.

Breeding

Moonlight Gouramis build bubble nests at the water’s surface, with males using bubbles and plant material to create the structure. Floating plants like Water Lettuce or Frogbit help stabilize the nest. During courtship, the male performs a dance before wrapping around the female to assist in egg-laying. Each spawn can yield up to 2000 eggs, which hatch in 2-3 days. Males guard the nest until the fry swim freely. Feed the fry infusoria or finely crushed food until they are large enough for daphnia or rotifers.

Lifespan

Moonlight Gouramis can live for 4-5 years in captivity when provided with proper care. Stable water conditions, a good diet, and a stress-free tank environment are essential for their longevity.

Tank Setup

To mimic their natural habitat, use a well-planted aquarium of at least 100 liters (~26 gallons). Floating plants like Amazon Frogbit or Salvinia create shade and encourage natural behaviors. Add driftwood and caves for hiding spots that reduce stress. Keep water parameters within ideal ranges: temperature 26-30°C (78.8-86°F), pH 6.0-7.0, and hardness 4-18°N (71.43-321.43ppm). Gentle filtration is critical to avoid disturbing bubble nests while ensuring clean water:

Sponge Filter: Provides soft water flow and excellent biological filtration, ideal for breeding tanks or smaller setups.
Internal Filter: Balances mechanical and biological filtration, suitable for mid-sized aquariums.
Canister Filter: Works best for larger tanks, offering superior filtration options, but adjust currents to avoid disrupting nests.

Frequent water changes are necessary to maintain water quality and prevent harmful buildup.

Compatible Tankmates

Moonlight Gouramis are peaceful and shy, making them great for community tanks. Suitable tankmates include:

Avoid aggressive or overly active species that may stress the gouramis or outcompete them for food. Adding plenty of hiding spots and visual barriers helps create a harmonious tank environment.

Short Description

The Moonlight Gourami (Trichogaster microlepis) is a peaceful and elegant fish native to Southeast Asia. Their silvery, shimmering bodies and graceful movements make them a stunning addition to any aquarium. Thriving in well-planted tanks with soft, slightly acidic water, they are ideal for community setups. With proper care, they provide a rewarding experience for aquarists of all levels.