Filament Licorice Gourami

Parosphromenus filamentosus is among the most threatened labyrinth fish, with wild populations severely impacted by deforestation and peat swamp drainage in Malaysia. Breeding programmes are critical for its survival. Males develop extraordinarily long, thread-like fin extensions when in prime condition and compete for cave spawning sites.

Water: 23–27°C, pH 4.0–6.0, very soft blackwater, tannin-rich. Tank: 30L minimum, tight caves, leaf litter, very gentle sponge filtration. Feeding: Live micro-invertebrates only — nano-daphnia, artemia nauplii, vinegar eels. Behaviour: Peaceful; males defend spawning caves but rarely harm other fish. Compatibility: Species tank strongly recommended; support conservation breeding.