Siamese Betta Male Fighter Fish 6cm – Assorted Colours

Bring colour and personality to your aquarium with the Male Siamese Fighting Fish (Betta splendens). Known for their striking colours, attractive fins and curious behaviour, male Bettas are a popular choice for freshwater aquarium enthusiasts.

At approximately 6cm, these male Bettas make excellent centrepiece fish for a dedicated aquarium. They often become familiar with their surroundings and may approach the front of the tank when their keeper is nearby.

Please note: Bettas are supplied in assorted colours and fin styles depending on availability. Images are a guide only, and the fish supplied may differ in appearance.

At a Glance

• Scientific Name: Betta splendens
• Common Name: Siamese Fighting Fish, Betta Fish
• Size Supplied: Approximately 6cm
• Sex: Male
• Colour: Assorted
• Temperament: Territorial towards other Bettas
• Care Level: Beginner to intermediate
• Diet: Carnivorous, primarily insect-based foods
• Origin: Southeast Asia; ornamental varieties are generally captive-bred

Why Choose a Male Siamese Fighting Fish?

Male Bettas offer an impressive display of colour and movement without needing a large community aquarium.

• Beautiful colours: Assorted males may display red, blue, green, purple or multicoloured patterns.
• Individual personalities: Bettas are active, inquisitive fish that explore their surroundings.
• Ideal feature fish: A single male can become the focal point of a planted aquarium.
• Suitable for smaller aquariums: They can thrive in a properly equipped aquarium of 20 litres or more.
• Interesting behaviour: Bettas use a specialised labyrinth organ to breathe air at the water surface.

Male Betta Fish Profile & Water Parameters

• Adult Size: Approximately 6–7cm, depending on variety
• Recommended Aquarium: 20 litres minimum for one male; larger tanks provide more swimming space and stability
• Temperature: 24–26°C recommended
• pH Range: 6.5–7.5 preferred
• General Hardness: Approximately 4–12 dGH
• Water Flow: Gentle, low-current filtration
• Swimming Level: Primarily upper and middle levels
• Diet: Quality Betta pellets supplemented with suitable frozen or live foods
• Lifespan: Commonly 3–5 years with appropriate care
• Compatibility: Best maintained individually; selected peaceful tankmates may be possible

Creating the Ideal Betta Aquarium

Male Siamese Fighters are best kept in a heated, filtered freshwater aquarium with gentle water movement. Their fins can make swimming against strong currents difficult, so avoid powerful filter outlets.

Provide hiding places, smooth decorations and live aquarium plants. Broad-leaved plants such as Anubias offer useful resting areas, while floating plants can create shaded spaces near the surface.

Bettas must be able to reach the surface to breathe atmospheric air. A secure aquarium lid is also important because they can jump.

Explore our live aquarium plants, sponge filters and aquarium heaters to help create a comfortable Betta habitat.

Feeding Your Male Betta

Siamese Fighting Fish are primarily carnivorous and naturally feed on small insects and other invertebrates.

Offer a high-quality Betta pellet as the main diet, supplemented occasionally with suitable frozen or live foods such as bloodworms, brine shrimp or daphnia.

Feed small portions once or twice daily, offering only what your fish can comfortably consume. Remove uneaten food to help maintain water quality.

Browse our aquarium fish food range for feeding options.

Can Male Bettas Live with Other Fish?

Male Siamese Fighting Fish are highly territorial towards other male Bettas and should not be housed together.

Some individuals may coexist with carefully selected peaceful community fish in a suitably sized aquarium. However, compatibility varies between individual Bettas.

Avoid aggressive species, fin-nipping fish and other fish with similar flowing fins. For most keepers, a single male Betta in a planted aquarium is the simplest and safest option.

Frequently Asked Questions

What size aquarium does a male Betta need?

A minimum of 20 litres is recommended for one male Betta. Larger aquariums provide more swimming space and help maintain stable water conditions.

Do male Siamese Fighting Fish need a heater?

Yes. Bettas are tropical fish and require a stable water temperature, ideally around 24–26°C. An appropriately sized aquarium heater and thermometer are recommended.

Can two male Bettas live together?

No. Male Bettas are territorial and can seriously injure or kill one another. Keep only one male in an undivided aquarium.

Can Betta fish live in a community aquarium?

Some male Bettas can live with peaceful tankmates in a suitably sized aquarium, but compatibility is not guaranteed. Individual temperament, hiding places and tankmate selection are important.

What colour Betta will I receive?

This product is supplied in assorted colours. Colour patterns and fin styles vary depending on available stock, so the fish received may differ from the product photograph.

Shop more varieties: Discover our complete range of Betta Fish and Siamese Fighting Fish available from Aquaholics Online.