Moonlight Gourami (Trichopodus microlepis)
The Moonlight Gourami (Trichopodus microlepis) is one of the most elegant and understated freshwater fish available to aquarists. Known for its silvery, moonlit sheen and calm demeanor, this species is a favorite among hobbyists who appreciate peaceful community aquariums with a natural aesthetic. Unlike more brightly colored gouramis, the Moonlight Gourami relies on subtle beauty, graceful movement, and interesting behavior to stand out.
Closely related to other well-known gouramis such as the Pearl Gourami and the Opaline Gourami, the Moonlight Gourami is an excellent choice for larger planted aquariums where it has room to glide calmly through the upper and middle water layers.
Natural Habitat and Origin
The Moonlight Gourami is native to Southeast Asia, particularly Cambodia, Thailand, Laos, and Vietnam. In the wild, it inhabits slow-moving rivers, floodplains, marshes, and densely vegetated swamps. These waters are typically warm, soft, and slightly acidic, with abundant plant cover and subdued lighting.
Understanding its natural environment helps aquarists recreate ideal conditions at home. Heavily planted aquariums with floating vegetation closely mimic the shaded, calm waters this species prefers.
Scientific Classification and Related Species
Taxonomy
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Anabantiformes
Family: Osphronemidae
Genus: Trichopodus
Species: Trichopodus microlepis
Related Gourami Species
Within the Trichopodus genus, Moonlight Gouramis are closely related to Pearl Gouramis and Three-Spot Gouramis. Compared to their relatives, Moonlight Gouramis are generally less aggressive and more reserved, making them particularly well suited to peaceful community tanks.
Appearance and Size
Moonlight Gouramis are named for their shimmering silver bodies that reflect light much like moonlight on water. A faint greenish hue is often visible, especially under warm aquarium lighting. Males develop a noticeable orange to reddish tint on the pelvic fins and throat as they mature.
Adult Moonlight Gouramis typically reach 12–15 cm (5–6 inches) in length. Their elongated body shape and long thread-like pelvic fins give them a graceful, flowing appearance as they swim.
Tank Size and Aquarium Setup
Due to their adult size and calm swimming style, Moonlight Gouramis require a minimum aquarium size of 200 litres (55 gallons). Larger tanks are strongly recommended, especially if keeping more than one gourami or housing them in a community setup.
Recommended Aquarium Setup
• Heavily planted aquarium with tall background plants
• Floating plants to diffuse light and provide security
• Soft substrate such as sand or fine gravel
• Driftwood and gentle décor for visual barriers
• Low to moderate water flow
Aquariums designed with natural aquascaping techniques work exceptionally well for this species. You can explore planting ideas in the Ultimate Guide to Freshwater Aquarium Plants.
Water Conditions
Stable water parameters are essential for long-term health. Moonlight Gouramis are sensitive to sudden changes, particularly in temperature and pH.
Temperature: 24–28°C (75–82°F)
pH: 6.0–7.5
Hardness: Soft to moderately hard (2–15 dGH)
Regular water changes and good filtration help maintain optimal conditions. Avoid strong currents, as this species prefers calm waters.
Diet and Feeding
Moonlight Gouramis are omnivorous and relatively easy to feed. In the wild, they consume insects, small crustaceans, algae, and plant matter.
Recommended Diet
• High-quality flakes or pellets
• Frozen or live foods such as bloodworms, brine shrimp, and daphnia
• Occasional blanched vegetables (spinach, zucchini)
• Algae-based foods for balanced nutrition
A varied diet enhances coloration, boosts immunity, and encourages natural behaviors.
Temperament and Community Compatibility
Moonlight Gouramis are peaceful and shy, making them excellent community fish when paired with calm tank mates. They can be intimidated by overly active or aggressive species.
Good Tank Mates
• Tetras and rasboras
• Corydoras catfish
• Peaceful loaches
• Dwarf cichlids with mild temperaments
• Other peaceful gourami species (with sufficient space)
Avoid fin-nippers or highly aggressive fish, as Moonlight Gouramis are slow-moving and non-confrontational.
Sexing Moonlight Gouramis
Sexing this species becomes easier as they mature. Males typically display brighter coloration, especially orange-red pelvic fins, and have a longer, more pointed dorsal fin. Females are slightly rounder in body shape and have duller fins.
Breeding Behavior
Moonlight Gouramis are bubble nest builders. Breeding is possible in captivity but requires preparation and a separate breeding tank.
Breeding Conditions
• Warm water (26–28°C)
• Soft, slightly acidic water
• Floating plants for bubble nest support
• Reduced water movement
After spawning, the male guards the bubble nest while the female should be removed. Fry hatch within 24–36 hours and require infusoria or finely powdered fry food.
Ease of Care
Ease of care is considered moderate. While Moonlight Gouramis are not overly demanding, they do best with experienced aquarists who can maintain stable water conditions and provide a calm environment.
Albino Moonlight Gourami
Albino Moonlight Gouramis are extremely rare and not commonly available in the aquarium trade. When encountered, they exhibit pale white to pinkish coloration with red eyes. Care requirements are identical to standard Moonlight Gouramis, though albino specimens may be more sensitive to bright lighting and stress.
Species Variations
Unlike some gourami species, Moonlight Gouramis have limited color morphs. Most variations are subtle differences in sheen and fin coloration rather than dramatic pattern changes.
Common Health Concerns
Moonlight Gouramis are generally hardy when properly cared for. Poor water quality can lead to common issues such as fin rot, bacterial infections, and parasitic diseases. Regular maintenance and quarantine of new fish are strongly recommended.
Frequently Asked Questions
Are Moonlight Gouramis good for beginners?
They are better suited for intermediate aquarists due to their size and sensitivity to unstable water conditions.
Can Moonlight Gouramis live alone?
Yes, they can be kept singly, but they often display more natural behavior when housed with peaceful tank mates.
Do Moonlight Gouramis need floating plants?
While not required, floating plants significantly improve comfort, reduce stress, and encourage natural behaviors.
Conclusion
The Moonlight Gourami (Trichopodus microlepis) is a refined and peaceful freshwater fish that thrives in well-planted, spacious aquariums. With proper care, stable water conditions, and compatible tank mates, this species rewards aquarists with graceful movement and subtle beauty that truly lives up to its name.
