Beacon Tetra

Hemigrammus ocellifer is a classic and enduring tetra species whose common name — the Head-and-Tail-Light Tetra — perfectly describes its most characteristic feature: two brilliant golden-orange spots, one at the upper edge of the eye and one at the caudal peduncle, that catch and reflect light beautifully in a well-lit aquarium. The body itself is relatively translucent silver, making the glowing spots all the more striking, particularly in groups. The Beacon Tetra is native to the slow-moving, often blackwater tributaries and floodplain lakes of South America, where it schools in large numbers among submerged vegetation and roots. In captivity, this species is among the hardiest and most forgiving of tetras, tolerating a wider range of water parameters than many of its relatives while still thriving best in soft, slightly acidic conditions. It is entirely peaceful and poses no threat to tankmates of any size. Keeping the Beacon Tetra in schools of 8 or more brings out the best in its behavior — confident schooling, natural exploration, and the full visual impact of multiple glowing spots moving in unison. It is an excellent choice for planted aquariums and South American biotope setups alike.

Tank Setup A 60-liter aquarium accommodates a comfortable school. Densely planted aquariums with dark substrate enhance the visual impact of the fish's metallic spots. Floating plants to diffuse lighting create a natural look and reduce stress. Driftwood adds tannins that soften and acidify water naturally.

Water Parameters Maintain pH 6.0–7.5, temperature 22–28°C, GH 2–15, KH 1–8. This species is adaptable and can tolerate a range of conditions, but prefers soft, slightly acidic water. Perform 20–25% weekly water changes using dechlorinated or RO-blended water in hard-water areas.

Filtration A gentle sponge filter or internal filter with a spray bar is ideal to avoid excessive current. Beacon Tetras are from slow-moving waters and prefer calm conditions. Adequate biological filtration is necessary to maintain water quality.

Diet Feed high-quality micro-pellets, quality flake food, frozen baby brine shrimp, daphnia, and cyclops. Offer varied foods to promote health and vibrant coloration. Feed twice daily in small portions — only as much as is consumed in two to three minutes.

Tankmates Excellent community fish; compatible with other small, peaceful tetras, rasboras, corydoras catfish, small loaches, and dwarf cichlids. Avoid predatory species or any fish large enough to consume them. Pairs well with a school of corydoras to cover bottom zones.

Breeding Egg scatterers; spawning is triggered by slightly lower temperature, dim lighting, and soft acidic water. Condition with live and frozen foods. Move a conditioning pair to a bare breeding tank with fine-leafed plants or spawning mop. Remove parents after spawning. Fry hatch in 24–36 hours and become free-swimming within a few days; feed infusoria then baby brine shrimp.