Filament Tetra Care Guide
Bryconaethiops microstoma · Freshwater Fish
What Filament Tetra look like
The Filament Tetra, scientifically known as Bryconaethiops microstoma, exhibits a medium-sized, laterally compressed body that typically reaches a maximum adult size of 3-4 inches (7.5-10 cm). Males are distinguished by their elongated filamentous extensions on the dorsal and anal fins, which can be quite pronounced, while females tend to have more rounded fins. The body is adorned with a lustrous silver coloration, complemented by a prominent dark horizontal stripe that runs along the lateral line, enhancing its visual appeal. Notably, the species possesses a well-defined lateral line system, which is crucial for detecting vibrations in the water. The dentition is adapted for an omnivorous diet, featuring small, conical teeth suitable for grazing on both plant matter and small invertebrates. Defensive adaptations include the ability to school in groups, providing safety in numbers, and the presence of fin extensions that may deter potential predators by creating an illusion of size.
Behavior & temperament
Filament Tetras are known for their social behavior, often found in small to medium-sized schools within their natural habitat. They predominantly inhabit the mid to upper water column, exhibiting a pelagic dwelling preference. These fish are relatively peaceful but can display hierarchical behaviors, particularly during breeding seasons. Breeding typically involves egg scattering, where females release eggs into the water column, allowing males to fertilize them externally. Their temperament is generally calm, although males may exhibit mild aggression towards one another during mating displays or territorial disputes.
Diet & feeding
In the wild, Filament Tetras are omnivorous, feeding on a varied diet that includes small invertebrates, algae, and plant matter. In captivity, they thrive on a balanced diet that includes high-quality flake food, live or frozen foods such as brine shrimp and daphnia, and vegetable matter to ensure their nutritional needs are met.
Behind the name
Bryconaethiops (from Greek 'bryco' meaning 'to grow' and 'naethiops' meaning 'Ethiopian'); microstoma (from Greek 'micro' meaning 'small' and 'stoma' meaning 'mouth').
Plan your tank
Check the numbers before you buy: tank volume, a stocking plan, cycle progress, water changes, and your ongoing care routine.
Keeping Filament Tetra?
AquaLens identifies your fish and plants from a photo, tracks water chemistry, and flags health issues early — free on iOS and Android.
