Black Widow Tetra
Gymnocorymbus ternetzi
What you need to keep a Black Widow Tetra
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pH
6–7.5
Temperature
22–26 °C
Max size
6 cm
Min tank
75 L
Where to buy
Compare prices from SA aquarium shops listing Black Widow Tetra.
What Black Widow Tetra costs in South Africa
7 price points from 4 shops over 90 days
R30
cheapest of 4 shops today
SA median R35 across 4 shops over the last 90 days.
4 shops
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Overview
What to know before you buy.
A hardy, deep-bodied tetra sold in normal, albino and long-finned forms. Keep in a group of six or more; small groups tend to harass long-finned tankmates.
Care guide
Keeping Black Widow Tetra healthy in a South African setup.
Tank setup
A minimum 75L aquarium suits Black Widow Tetra. Match décor to its natural habitat: planting, rockwork or open swimming room as needed.
Water parameters
Keep pH 6–7.5 and 22–26°C. Stable parameters matter more than chasing perfect numbers; acclimate new arrivals slowly.
Feeding
Omnivore — flake, frozen. Feed small amounts it clears in a couple of minutes, and vary the diet.
Behaviour
Active shoaler, can nip fins. Watch it at feeding time and at lights-out to see its real temperament in your tank.
Tankmates
Choose tankmates of similar size and temperament with the same water needs. Avoid fin-nippers and anything large enough to eat it.
Breeding
Breeding success with Black Widow Tetra depends on the line and water chemistry; ask your shop about proven pairs.
Settling this fish in?
Condition the tap water, seed the filter, test through the first weeks — most early losses trace back to one of those.
10% off your first order, no code, at checkout
Availability confirmed with the distributor before dispatch · free delivery over r750
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Market intelligence
Price trends and buyer demand — data only FishHub tracks.
Price history — last 90 days
SA price range this month: R30–61 · Average: R46
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Demand by province
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