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Betta splendens

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

Moderate Care
Aggressive
£20.99Sold 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.
£19.95 tracked delivery — half price (£9.98) from £100.00, free from £200.00. One delivery charge however many fish you add — everything travels together with a licensed live-animal courier.
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A striking red double tail betta with flowing fins and bold personality, ideal for a warm, planted species tank. Moderate care, aggressive. 24-30C, pH 6.0-7.5.

Care at a Glance

Scientific Name
Betta splendens
Max Adult Size
up to 7.5 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.

Similar choices available now

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

Twin caudal lobes give the double tail its unmistakable silhouette: the tail fin genuinely split into two full halves, backed by the broader dorsal fin characteristic of the type. Dressed entirely in red and reaching a substantial 7.5 cm, this male is among the larger ornamental bettas we list, and the doubled tail means there is simply more moving finnage on display than any single-tailed fish can offer.

An aggressive temperament rating keeps the stocking plan conservative. Snails make safe neighbours; some peaceful shrimp can persist in heavily planted tanks though predation happens; and carefully selected peaceful bottom-dwellers are possible in larger tanks, with caution and a watchful first week. Leave out other male bettas, fin-nipping fish, aggressive or territorial species, very small fish or shrimp that may be eaten, and bright or long-finned fish that wind him up. He is moderate care: the one extra consideration with double tails is that all that finnage appreciates calm water, so baffle strong filter outflows. Give him 25 litres or more at 24–30 °C, pH 6.0–7.5, hardness 1–15 dGH; he keeps to the upper levels and may turn more territorial over time.

Bigger betta, slightly different bookkeeping. At 7.5 cm he takes larger carnivore portions than a standard male, and the 25-litre minimum on his record reflects both his size and the waste that comes with it — volume is your buffer. The doubled tail is heavy lifting for any fish, so along with baffled flow give him shallow resting points near the surface; double tails use them more than any other fin type we stock. His red colouring deepens with feeding quality, making diet the most visible lever you control. Otherwise his moderate rating is honest: heater inside 24–30 °C, pH inside 6.0–7.5, weekly water changes, and a watchful eye whenever anything new enters his territory.

Red double tail care card

  • Up to about 7.5 cm
  • Typical lifespan 3 years
  • Moderate keeper level
  • Aggressive nature
  • 24–30 °C temperature
  • pH window 6.0–7.5
  • 1–15 dGH range
  • At least 25 litres
  • Carnivorous
  • Upper-tank swimmer

Delivery and selection

Double tails are a small fraction of any betta spawn, which keeps availability tighter than standard fin types — if this red male is listed in stock, he is ready to ship. UK delivery uses a licensed live-animal courier and carries our live arrival guarantee.

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.