Dwarf Gourami (Trichogaster lalius)

You must keep one male per aquarium, or one male with 2-3 females in a tank of at least 20 gallons (75 liters) with a footprint of 24x12 inches (60x30 cm). Dwarf gouramis (Trichogaster lalius) are highly territorial at the surface; multiple males in tanks under 30 gallons (113 liters) will fight over bubble nest territory, causing torn fins, stress-induced immunosuppression, and increased susceptibility to Dwarf Gourami Iridovirus (DGIV).

For a single male, a 10-gallon (38 liter) tank is the absolute minimum. Provide dense floating plants (Water Sprite, Hornwort, Salvinia) and at least 2 separate surface hiding spots created by driftwood or broad-leaf plants. Never house with other anabantoids (bettas, paradise fish, sparkling gouramis) as they will engage in labyrinth organ combat at the surface.

Target the following parameters for optimal health and coloration:

• pH: 6.0 - 7.2 (slightly acidic to neutral)
• General Hardness (GH): 4 - 10 dGH (soft to moderately hard)
• Carbonate Hardness (KH): 3 - 8 dKH
• Total Dissolved Solids (TDS): 80 - 200 ppm
• Electrical Conductivity: 160 - 400 μS/cm
• Temperature: 75°F - 82°F (24°C - 28°C)
• Nitrates: Below 15 ppm
• Ammonia/Nitrite: 0 ppm at all times

They require calm water with minimal surface current; strong flow stresses them and prevents bubble nest construction. Maintain nitrates below 15 ppm with weekly 20% water changes. Use a sponge filter or baffled hang-on-back filter. Add Indian almond leaves (1 per 5 gallons) to boost immunity and create a natural blackwater environment. Avoid ammonia above 0.25 ppm, which permanently damages the labyrinth organ. Hardness below 3 dGH causes clamped fins and osmotic stress.

Dwarf Gouramis are omnivores requiring approximately 40% protein, 10% fat, 50% plant matter in their diet. Feed premium tropical flakes, micro pellets, freeze-dried bloodworms, and frozen brine shrimp twice daily in amounts consumed within 2-3 minutes. Offer spirulina flakes and blanched peas (shelled) weekly to prevent constipation and support digestive health.

Medication Sensitivity Alert: Dwarf Gouramis tolerate copper-based medications at 0.15 mg/L but are highly sensitive to formalin and malachite green combinations. Praziquantel is safe for deworming. Avoid salt treatments above 3 ppt (they have low salt tolerance). For bacterial infections, quarantine with metronidazole for 10 days at standard dosage.

Critical DGIV Warning: They are notoriously susceptible to Dwarf Gourami Iridovirus (DGIV), a strain of ISKNV megalocytivirus. There is no cure. Infected fish must be removed and euthanized immediately to prevent tank-wide contamination. Quarantine all new gouramis for 4-6 weeks minimum.

Pre-Conditioning: Condition a male and female with live blackworms, brine shrimp, and bloodworms for 2 weeks. Both sexes must be at least 6 months old, preferably 8-12 months. Females should show visible egg swelling in the abdomen.

Breeding Tank Setup: Use a 10-gallon (38 liter) tank with 6 inches (15 cm) of water depth, pH 7.0, dGH 6, and temperature raised to 80°F-82°F (27°C-28°C). Add floating plants (Salvinia, Cabomba draped at surface) and a piece of styrofoam or Indian almond leaf as a bubble nest anchor. Use a mature sponge filter only—no strong current.

Spawning Process: Introduce the female first for 24 hours, then add the male. The male builds a bubble nest under the cover within 12-24 hours. Spawning occurs with the male wrapping around the female; 200-500 eggs float to the nest. Remove the female immediately after spawning. The male guards the nest until fry hatch (24-36 hours). Remove the male after fry become free-swimming (day 3).

Fry Rearing: Feed infusoria for 5 days, then baby brine shrimp nauplii. Perform small daily water changes using airline tubing covered with muslin. Cull 50% of fry by week 4 to prevent stunting.