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Bahia Black Diamond Tetra: A Comprehensive Guide (Hyphessobrycon negodagua)

The Bahia Black Diamond Tetra (Hyphessobrycon negodagua) is a striking and relatively uncommon tetra from eastern Brazil that has slowly gained attention among aquarists who enjoy unusual characins. Known for its dark, shimmering body and elegant appearance, this species can be especially attractive in planted aquariums where its coloration contrasts beautifully against green plants and darker substrates.

Although not widely available in most aquarium stores, the Bahia Black Diamond Tetra occasionally appears through specialty importers and is highly appreciated by hobbyists who enjoy keeping rare or lesser-known tetra species. Like many members of the genus Hyphessobrycon, it is a peaceful schooling fish that thrives in well-maintained community aquariums.

Natural Distribution & Habitat

Hyphessobrycon negodagua is native to eastern Brazil, where it occurs in coastal river systems within the state of Bahia. Unlike many well-known tetras that originate from the Amazon basin, this species is associated with Atlantic coastal drainages.

Typical habitats include:

  • Small forest streams

  • Shallow tributaries

  • Slow-moving creeks

  • Areas with submerged vegetation and leaf litter

These environments often feature soft, slightly acidic water, moderate shade from surrounding vegetation, and substrates composed of sand, organic debris, and plant material.

Because these habitats are typically calm and plant-rich, the fish are well suited to planted aquariums that provide both cover and open swimming areas.

Size

The Bahia Black Diamond Tetra is a small fish typical of many Hyphessobrycon species.

Typical adult size:

  • Length: 1.5–2 inches (4–5 cm)

Their compact size makes them well suited for peaceful community aquariums and planted tanks.

Aquarium Care

Hyphessobrycon negodagua thrives in aquariums that mimic the calm, plant-filled environments of Brazilian streams.

Recommended aquarium setup:

  • Tank size: 15–20 gallons minimum

  • Aquascape: Planted aquarium with driftwood and shaded areas

  • Substrate: Sand or fine gravel

  • Lighting: Moderate lighting

Plants such as Amazon swords, Cryptocoryne, stem plants, and floating plants help replicate the natural conditions these fish prefer.

Because they are schooling fish, they should be kept in groups of at least 6–8 individuals, though larger schools tend to produce more natural behavior and a more impressive display.

Water Parameters

Like many South American tetras, Bahia Black Diamond Tetras prefer relatively soft and slightly acidic water.

Recommended parameters:

  • Temperature: 74–80°F (23–27°C)

  • pH: 6.0–7.2

  • Hardness: Soft to moderately soft water (2–10 dGH)

They are adaptable to typical community aquarium conditions but do best in stable water with regular maintenance.

Diet

In the wild, Hyphessobrycon negodagua feeds on small invertebrates and organic matter found in the water column.

In the aquarium they readily accept:

  • High-quality flake foods

  • Small micro pellets

  • Frozen foods such as daphnia, cyclops, and baby brine shrimp

  • Live foods like microworms or brine shrimp

Offering a varied diet helps maintain strong health and encourages vibrant coloration.

Behavior & Tank Mates

Bahia Black Diamond Tetras are peaceful schooling fish that do well in community aquariums with other small, non-aggressive species.

Suitable tank mates include:

  • Other small tetras

  • Rasboras

  • Pencilfish

  • Corydoras catfish

  • Small peaceful dwarf cichlids

They typically occupy the middle regions of the aquarium, forming loose schools as they move through open water.

Their calm temperament makes them an excellent addition to planted aquariums with other peaceful fish.

Breeding

Like many Hyphessobrycon species, Bahia Black Diamond Tetras are egg-scattering spawners.

During spawning:

  • Eggs are scattered among fine-leaved plants or spawning mops

  • Adults may consume the eggs if left in the breeding tank

  • Eggs typically hatch within 24–36 hours

Fry are extremely small and initially require microscopic foods such as infusoria before transitioning to baby brine shrimp.

Because this species is not widely bred by hobbyists, detailed breeding reports are limited.

Fun Facts & Interesting Quirks

The Bahia Black Diamond Tetra has several characteristics that make it appealing to aquarists.

It comes from coastal Brazilian rivers rather than the Amazon.
Many tetras originate from the Amazon basin, but this species is associated with Atlantic coastal drainages in eastern Brazil.

Its coloration becomes richer in darker aquariums.
Using dark substrates, driftwood, and tannin-rich water can enhance the depth of its coloration.

It’s still uncommon in the aquarium trade.
Most aquarists encounter this species through specialty importers that focus on rare characins.

It fits perfectly into Brazilian biotope aquariums.
Aquarists interested in regional setups often include species from Atlantic forest drainages, making this tetra a great candidate.

Why Aquarists Love Them

Although not widely known, Hyphessobrycon negodagua has developed a following among aquarists who enjoy unusual tetras.

Reasons hobbyists appreciate this species include:

  • Dark, elegant coloration

  • Peaceful schooling behavior

  • Compatibility with planted aquariums

  • Unique geographic origin

  • An uncommon species that stands out in community tanks

For aquarists interested in expanding beyond the most common tetra species, the Bahia Black Diamond Tetra can be a rewarding and beautiful addition.

Looking to Add Fish to Your Aquarium?

If you're looking to add new fish to your aquarium, we recommend purchasing from trusted retailers known for their healthy livestock and excellent selection. The Wet Spot Tropical Fish has one of the best selections of rare and high-quality freshwater fish in the hobby, with excellent shipping and consistently healthy stock. Moonlight Aquatics is another fantastic source, especially for uncommon species and great prices on unique fish you don’t see everywhere. If you’re looking to add shrimp to your tanks, Buy Pet Shrimp specializes in hardy, well-bred freshwater shrimp that ship safely and arrive in great condition.

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