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Betta splendens

Betta spl. male double tail white - Betta Fish for Sale UK

Moderate Care
Aggressive
£21.99Sold Out

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Live arrival guaranteed. If they don’t arrive healthy, email us a short unboxing video the same day for a replacement or refund. Packed in oxygenated bags with insulation and heat packs when needed.
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A striking white double-tail betta with flowing fins and bold personality, ideal for a warm, well-maintained solo aquarium. Moderate care, aggressive. 24-30C, pH 6.0-7.5.

Care at a Glance

Scientific Name
Betta splendens
Max Adult Size
up to 6 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Aggressive
Temperature
24–30°C
pH Range
6–7.5
Hardness
1–15 dGH
Minimum Tank
25L
Diet
Carnivore

Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller. Product-photo provenance and any image-specific limitations are stated on the listing.

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Blue and red male Betta splendens swimming side-on in an aquarium
Full Care Guide

Betta Fish Care Guide: Siamese Fighting Fish

For one typical domestic Betta splendens, start with at least 20 litres, a mature filter, thermostatic heater, separate thermometer, gentle flow, a secure lid with surface access, and plants or refuges. Keep one male per aquarium.

13 min readRead guide

Water Parameters

Maintain these water conditions for optimal health and vibrant colors

Temperature
24–30°C
24°CIdeal30°C
pH Level
6–7.5
6Ideal7.5
Water Hardness
1–15 dGH
1 dGHIdeal15 dGH

In all-white form the double tail reads almost sculptural: two full caudal lobes and the type's tall dorsal, every fin rendered in the same unbroken white on a 6 cm male. Where coloured bettas catch the eye with contrast, a white double tail does it with shape and movement alone — a minimalist's showpiece, especially against dark aquascaping where the outline does all the work.

This is a moderate-care fish with an aggressive temperament, so build the tank around him rather than adding him to an existing community. The record permits small peaceful snails, peaceful shrimp in some setups with hunting an accepted risk, and very carefully selected peaceful tank mates only in larger, heavily planted aquariums. It rules out other male bettas, fin-nipping species such as tiger barbs, aggressive cichlids, large predators, long-finned fish that provoke displays, and overly active or boisterous company. Keep him in 25 litres or more at 24–30 °C, pH 6.0–7.5, hardness 1–15 dGH. He rides the upper water; white finnage also makes any nip or tear obvious early, which is one quiet advantage of the colourway for an attentive keeper. Breeding condition raises his territorial edge.

Keeping white finnage white is the particular craft of this fish. Pristine water keeps the fins bright; declining water dulls them days before a test kit would have told you, which makes him his own early-warning system. Weekly changes inside the recorded pH 6.0–7.5 and 1–15 dGH bands, a heater pinned in the 24–30 °C range and measured carnivore feeding are the whole formula. His 25-litre minimum leaves room for the gentle, surface-calm filtration double tails need. Settle him with subdued lighting for the first day or two; white fish show arrival stress visibly, and giving him a quiet start gets the finnage carried high noticeably sooner. Expect his territorial side to surface mainly around breeding condition.

White double tail data

  • Approximately 6 cm long
  • Lifespan near 3 years
  • Care: moderate
  • Aggressive temperament
  • Heat 24–30 °C
  • pH from 6.0 to 7.5
  • Hardness 1–15 dGH
  • Minimum 25 litres
  • Carnivorous diet
  • Top-of-column swimmer

Purchase notes

White double tails surface in our stock irregularly; when listed, the fish shown as available is on-site and ready for despatch by licensed live-animal courier under our live arrival guarantee, UK-wide.

Customer Reviews

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What customers say about ordering from us

  • 4 out of 5Verified buyer

    I have a small group of long finned mountain minnows. So was delighted to be able to order ten of this variety to increase the genetics in my tank . The ones I recieved are healthy but it’s to early to give a verdict on wether they are of a long finned type since they are small currently.

    Gordon Walker · 23 Sept 2026

  • 5 out of 5Verified buyer

    100% success travel and "installation". Pleased with quality of purchase. The Siamese fighter a bit "shy" so have not yet seen him at his best yet but looking good. Happy customer. GG

    George E Garratt · 21 Sept 2026

Reviews of our shop, collected by Judge.me, an independent third-party review collector. Newest first.