All fish / Ambassidae

Filament Glassfish

Gymnochanda filamentosa

Also known as glassfish, glass perch, filament glass fish, threadfin glassfish, filamentous glassfish, sailfin glassfish, ikan kaca, ギムノチャンダ・フィラメントーサ, 丝鳍玻璃鱼

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A tiny, see-through glassfish from soft, acidic forest streams and peat swamps. Males grow long trailing rays on their dorsal and anal fins and pick up a bluish sheen, so a well-kept group looks striking in a quiet planted tank.

Care at a glance

Care level

Hard

Temperament

Peaceful

Adult size

3.5 cm

Temperature

24 to 28 °C

pH

5 to 6.5

Smallest tank

45 litres

Keep as

Group of 8 or more

Diet

Carnivore: live and frozen foods such as daphnia, cyclops, brine shrimp and bloodworm

Swims

Middle of the tank

Lifespan

2 to 4 years

Water

Freshwater

Wild range

Peninsular Malaysia, Singapore and Indonesia (Sumatra, Borneo)

Breeding

It scatters eggs among fine plants and males display strongly to each other. Spawning has happened in soft, acidic water, but the fry are very small and need infusoria, so raising them is hard.

Good to know

Wild-caught fish are delicate, often refuse dry food and do poorly in hard water, so keep them with small, calm tankmates only. Do not confuse it with dyed or injected glassfish such as Parambassis ranga.