One female Double Tail Betta with variable colours and markings. Keep singly in a heated, covered, gently filtered aquarium; allow clear surface access.

Care at a Glance

Scientific Name

Betta splendens

Max Adult Size

up to 7 cm

Lifespan

3 years

Care Level

Easy

Temperament

Aggressive

Temperature

24–30°C

pH Range

6–7.5

Hardness

2–15 dGH

Minimum Tank

20L

Diet

Carnivore; betta pellets, frozen bloodworms, brine shrimp, daphnia

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.

Water Parameters

Temperature

24–30°C

24°CIdeal30°C

pH Level

6–7.5

6Ideal7.5

Water Hardness

2–15 dGH

2 dGHIdeal15 dGH

Betta splendens

Double Tail Female Betta Mix (Betta splendens) – Single Female

Name: Double Tail Female Betta Mix (Betta splendens) – Single Female
Brand: Tropical Fish Co
SKU: 7354
Price: 6.19 GBP
Availability: InStock

Beginner Friendly

Aggressive

£6.19

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.

Read our reviews on Google or see verified buyer reviews and photos. Human support, careful packing and clear delivery updates for live aquatics.

One female Double Tail Betta with variable colours and markings. Keep singly in a heated, covered, gently filtered aquarium; allow clear surface access.

Care at a Glance

Scientific Name

Betta splendens

Max Adult Size

up to 7 cm

Lifespan

3 years

Care Level

Easy

Temperament

Aggressive

Temperature

24–30°C

pH Range

6–7.5

Hardness

2–15 dGH

Minimum Tank

20L

Diet

Carnivore; betta pellets, frozen bloodworms, brine shrimp, daphnia

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

2–15 dGH

2 dGHIdeal15 dGH

Double Tail Female Betta Mix is a domestic Betta splendens line selected for the split double-tail shape. One quantity buys one female. Colours and markings are mixed and naturally variable, so the fish received will not necessarily match a particular gallery image.

Care at a glance

Scientific name: Betta splendens
Sale unit: one female per quantity
Aquarium: 20 litres minimum; 25–40 litres gives a more stable solo setup
Temperature: 24–30°C published range; around 25–27°C is a practical stable target
Water: pH roughly 6.0–8.0, stable and fully cycled
Flow: gentle, with unobstructed surface access
Diet: quality betta pellets plus small frozen or live invertebrate foods

Housing and temperament

A single female is the safest default. Female bettas can still be territorial and aggressive, and two females should not be treated as an automatic pair. Sorority-style groups are an advanced social setup requiring a much larger, densely structured aquarium, several fish and a ready separation plan; they are not recommended simply because the fish are female.

Use a secure lid, gentle biological filtration, broad-leaved or floating plants and clear access to warm humid air above the water. The labyrinth organ allows atmospheric breathing but does not make unfiltered or uncycled water safe.

Feeding

Feed small portions of a complete betta pellet once or twice daily and rotate suitable frozen foods such as daphnia, brine shrimp or bloodworm. Remove leftovers. Reduced appetite should trigger a check of temperature, water quality and stress before extra food is added.

Frequently asked questions

Will I receive the exact colour shown?

No. This is a mixed-colour line and each fish varies.

Can this female live with another betta?

Do not assume so. Individual temperament varies and direct betta-to-betta housing can cause serious aggression.

Does a female betta need a heater?

In most UK homes, yes. Use a thermostat-controlled heater to keep the aquarium consistently within the tropical range.

For a different display in a separate aquarium, compare the Double Tail Male Betta Mix. This is an alternative to the female offered here, not a recommendation to house them together.

Species reference: FishBase: Betta splendens.

Is quantity one a pair?

No. Quantity one is one female.

Frequently Asked Questions

Can I keep a female betta in a 5 gallon tank successfully?

Yes, a 5 gallon tank is suitable for one female betta. Aim for 20 litres or more, gentle filtration, and stable 24–30°C water. A complete heated and filtered setup matters more than fancy décor.

Should I choose a 10 gallon tank kit for one female betta?

Yes, a 10 gallon kit is an excellent choice for one female betta. Extra water volume keeps conditions steadier and gives more room for plants and hides. Maintain it with regular partial water changes.

Can I keep two female betta fish together in the same tank?

Usually no, not as a pair. Female bettas can still be territorial. Keep this female singly as the safest default; group housing is an advanced setup requiring space, dense cover and a ready separation plan.

Can I keep three female betta fish together in a 10 gallon tank?

No, 3 females in 10 gallons is risky. Keep singly as the safest default. Any attempt at group housing requires much more space, plants, sight breaks and a ready separation plan.

Are female betta fish smaller than males when fully grown in aquariums?

Yes, females are often slightly smaller and less finnage-heavy than males, though this fish still reaches about 7 cm. Appearance varies by strain and age.

Are female betta fish colourful and pretty enough for a display aquarium?

Yes, female bettas can be very colourful, especially double tail varieties. They may show less extreme finnage than males, but vivid patterning still stands out. Appearance depends on genetics and maturity.

What water temperature should a female betta tank stay at?

Keep a female betta at 24–30°C, with 25–27°C ideal for daily care. Stable warmth supports appetite, colour, and immunity. Use a thermometer to check the temperature.

Is 90 degree water too hot for a female betta?

Yes, 90°F is about 32.2°C, which is above the recommended 24–30°C range. Prolonged heat can stress a betta and lower oxygen levels. Overheating needs prompt attention.

How long can a female betta live in cold water?

Not long without stress, because bettas are tropical fish needing 24–30°C. Cold water slows digestion, weakens immunity, and causes lethargy. Check the heater and restore stable warmth gradually.

Can I heat a small betta tank properly without using a heater?

No, not reliably in the UK. Room temperature fluctuates too much for a tropical betta, especially in small tanks. Use a proper adjustable heater and monitor it with a thermometer.

What pH and water hardness does a female betta need?

Aim for pH 6.0–7.5 and hardness 2–15 dGH. Stable parameters matter more than chasing exact numbers. Condition replacement water and avoid sudden changes.

Why is my female betta jumping in the tank or out?

Jumping can signal stress or poor water quality, and a missing lid allows escape. Keep water warm, calm, and clean, with surface access for breathing. Check water quality if the aquarium becomes cloudy.

Can a female betta live in a plant tank or vase?

A planted tank, yes; a vase, no. Bettas need at least 20 litres, filtration, and open surface access for air breathing. Prioritise swimming space when decorating.

What do I need for a proper female betta tank setup?

You need a 20L+ tank, heater, lid, gentle filter, and hiding plants. Bettas prefer calm water and top access to breathe. Keep the setup fully cycled before adding the fish.

How often should I clean and change water in a betta tank?

Change small amounts weekly, usually 20–30%, and avoid stripping all beneficial bacteria. Regular maintenance keeps ammonia low and fins healthy. Remove waste and condition replacement water.

Which tank mates are safest with a female betta in community tanks?

Corydoras, Kuhli Loaches and snails may be considered; shrimp require caution. Suitability depends on aquarium size, layout and the betta’s temperament. Avoid fin nippers, tiger barbs, guppies and direct housing with male bettas.

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What customers say about ordering from us

4.6 on Google Maps 4.4 · 91 shop reviews read them

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