Black Widow long fin (Gymnocorymbus ternetzi long fin) - Tetra Fish for Sale UK

Black Widow long fin (Gymnocorymbus ternetzi long fin) is part of our Gymnocorymbus range. Black Widow long fin (Gymnocorymbus ternetzi long fin) from our Gymnocorymbus range. Check care, compatibility and delivery details before ordering.

The care data below is built from the trusted supplier and site catalogue fields for this exact SKU. The written guide is structured for quick checking before purchase, with the important care, compatibility and delivery points kept together.

Quick facts

Aquarium setup

Black Widow long fin (Gymnocorymbus ternetzi long fin) should be added to a mature, stable aquarium with suitable filtration, compatible tank mates, and enough space for the adult size of the species or strain.

Behaviour and tank mates

Black Widow long fin (Gymnocorymbus ternetzi long fin) should be observed after introduction so you can spot stress, chasing or feeding problems early.

Black Widow long fin (Gymnocorymbus ternetzi long fin) should be matched with tank mates using the adult size, temperament, water parameters and feeding behaviour on this page. Introduce carefully and watch the first week after delivery.

Feeding and routine care

Feed Black Widow long fin (Gymnocorymbus ternetzi long fin) with suitable aquarium foods for its group, using modest portions and watching appetite, body condition and water quality.

Health, delivery and acclimation

Only add Black Widow long fin (Gymnocorymbus ternetzi long fin) to a mature aquarium with stable water. When your order arrives, float and acclimate slowly, keep the lights low, and avoid feeding heavily on the first day. Watch breathing, posture, colour and appetite during the first week.

Why buy from Tropical Fish Co?

We connect the listing, SKU, care notes and stock data so you can order the exact animal shown on this page. Livestock is packed in oxygenated bags with insulation and heat packs when needed, then sent by tracked UK courier with live arrival support.

Before you order

Use the facts on this page as a final check before adding Black Widow long fin (Gymnocorymbus ternetzi long fin) to your basket. Confirm the adult size, water conditions, feeding style and behaviour suit the aquarium you already have, then choose tank mates that will not outcompete, bully or stress it after delivery.

If you are building a new setup, let the aquarium mature first and avoid mixing livestock with very different temperature, pH or temperament needs. A careful match at the start is usually the difference between a calm community tank and avoidable losses later.