The Siamese Fighting Fish is an aquarium icon known for its labyrinth organ (allowing air breathing) and vivid colors. While hardy, they require heated, filtered water (24-30°C). Males are solitary and fiercely territorial. Females are generally less ornate but can be kept in 'sororities' with strict precautions (minimum 5 females in 75L+).
At a Glance
Tank Requirements
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Water Parameters
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Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Male (Long Finned)
The classic commercial Betta with long, heavy fins. High territorial instinct, but low mobility limits their threat level in community tanks. Requires low flow to prevent exhaustion.
Differs in 3 traits from base species
Also known as: Veiltail, Halfmoon, Delta, Rosetail, Crown Tail, Standard, Double Tail
Male (Plakat / Short Finned)
Short-finned males closer to the wild form. Without the drag of long fins, they are fast, active hunters and significantly more aggressive towards tank mates than long-finned varieties.
Differs in 3 traits from base species
Also known as: Plakat, HMPK, Alien, Wild Type, Koi Betta, Samurai
Female
Can be kept singly (recommended) or in 'sororities'. A sorority requires 5+ females in a heavily planted 20-gallon (75L) tank minimum to spread aggression. Never keep 2, 3, or 4 females together as bullying will be lethal.
Differs in 4 traits from base species
Also known as: Sorority, Girl, Female Betta
Giant / King Betta
Selectively bred for massive size (up to 10-12cm). Their larger mouth size makes them a high predation risk for small schooling fish (Tetras, Rasboras) that standard Bettas ignore.
Differs in 5 traits from base species
Also known as: Giant, King, Half-Giant
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🟢Ideal Tank MatesBetta (Siamese Fighting Fish) Care Guide Summary
The Betta (Siamese Fighting Fish), scientifically known as Betta splendens, belongs to the Anabantoids family group. Adults reach a maximum size of approximately 7 cm and have a compressed body shape with a moderate growth rate. Classified as semi-aggressive, this species primarily occupies the surface and mid-level zones of the aquarium and produces a low level of biological waste.
To thrive, the Betta (Siamese Fighting Fish) requires a freshwater only aquarium with a minimum volume of 19 litres and a tank length of at least 30 cm. Water temperature should be maintained between 24°C and 30°C, with a pH range of 6–8 and a general hardness of 5–20 dGH. A low water flow is preferred. An aquarium test kit can help you monitor these values.
Due to its specialist needs, the Betta (Siamese Fighting Fish) is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 4 varieties: Male (Long Finned), Male (Plakat / Short Finned), Female, and Giant / King Betta. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Betta (Siamese Fighting Fish) Habitat Setup
When setting up an aquarium for the Betta (Siamese Fighting Fish), a low water flow best suits their natural preferences. Because this species occupies the surface and mid-level zones, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline and open swimming space in the centre of the tank for free movement. Useful additions include smooth gravel or rounded substrate to protect their sensitive barbels, dense planting to provide cover, break sightlines, and reduce stress, and floating plants to diffuse overhead light and create shaded areas. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper. Browse smooth aquarium gravel options to find the best fit.
Betta (Siamese Fighting Fish) Compatibility Notes
Classified as semi-aggressive, the Betta (Siamese Fighting Fish) is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, ornamental shrimp are not safe companions, conspecific aggression can be intense, especially in smaller tanks, and territorial behaviour may cause issues if hiding spots or floor space are limited. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Betta (Siamese Fighting Fish).
5 Gallon
10 Gallon Standard
15 Gallon Standard
20 Gallon High
20 Gallon Long
29 Gallon Standard
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Betta (Siamese Fighting Fish) Feeding & Diet Considerations
The Betta (Siamese Fighting Fish) will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups and will eat fry, so breeding efforts in the same tank are unlikely to succeed. Find quality Betta (Siamese Fighting Fish) fish food for this species.
Frequently Asked Questions About Betta (Siamese Fighting Fish)
How big does Betta (Siamese Fighting Fish) get?
Betta (Siamese Fighting Fish) (Betta splendens) typically reaches a maximum adult size of approximately 7 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Betta (Siamese Fighting Fish) need?
A minimum aquarium volume of 19 litres and a tank length of at least 30 cm are recommended for Betta (Siamese Fighting Fish). This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Betta (Siamese Fighting Fish) need?
Betta (Siamese Fighting Fish) thrives in freshwater only conditions with a temperature range of 24–30°C, a pH between 6 and 8, and a general hardness of 5–20 dGH. A low water flow is preferred.
Is Betta (Siamese Fighting Fish) peaceful or aggressive?
Betta (Siamese Fighting Fish) is classified as semi-aggressive with an aggression score of 5 out of 10. They can work in community setups but may clash with certain tankmates.
Can Betta (Siamese Fighting Fish) live with others of its kind?
No. Only one Betta (Siamese Fighting Fish) should be kept per tank. Keeping multiples in the same aquarium typically results in aggression and stress.
Is Betta (Siamese Fighting Fish) safe with shrimp?
No. Betta (Siamese Fighting Fish) is known to eat ornamental shrimp and is not recommended for shrimp tanks. Even larger shrimp species like Amano Shrimp may be at risk.
Does Betta (Siamese Fighting Fish) have any special tank requirements?
Yes. Betta (Siamese Fighting Fish) benefits from plants - densely covered, plants - floating, and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Betta (Siamese Fighting Fish) need a lid on the tank?
Yes. Betta (Siamese Fighting Fish) is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Similar Species
Siamese Algae Eater
Crossocheilus oblongus
Famous for being one of the few freshwater fish that actively consumes Black Beard Algae (BBA). A torpedo-shaped, active bottom-to-midwater swimmer native to Southeast Asian streams. True Siamese Algae Eaters feature a distinct black horizontal stripe that extends all the way through the tail fin. As they mature, they can become lazy, preferring prepared foods over algae, and may occasionally chase other bottom dwellers.
Dwarf Gourami
Trichogaster lalius
A peaceful to semi-aggressive labyrinth fish native to South Asia. Famous for their brilliant metallic blue and red stripes. While generally suitable for community tanks, males are territorial toward each other and similar-looking fish. They are sensitive to water quality and prone to Iridovirus if stressed. Requires access to the surface to breathe.
Paradise Fish
Macropodus opercularis
One of the first ornamental fish in the hobby (pre-dating the Goldfish in Europe). Paradise Fish are stunning, hardy, subtropical Anabantoids. However, they are notoriously aggressive, often exceeding the aggression of Bettas. They are cold-tolerant and thrive in unheated indoor aquariums, but they will readily attack smaller tank mates, eat fry, and fight conspecifics to the death.
Discus
Symphysodon aequifasciatus
Known as the 'King of the Aquarium', Discus are stunning, heavily laterally-compressed cichlids. They are famous for their demanding husbandry, requiring high temperatures (28-32°C / 82-90°F), pristine water quality, and specialized diets. They are schooling fish that establish a strict pecking order and must be kept in groups to prevent intense bullying of a single weaker fish.
Guppy
Poecilia reticulata
One of the most iconic and widely kept aquarium fish. Renowned for their incredible colors, hardiness, and prolific breeding. As livebearers, they give birth to fully formed, free-swimming fry. Males constantly pursue females for mating; therefore, a ratio of at least 2 females per male is strongly recommended to disperse stress.
Pearl Gourami
Trichopodus leerii
Widely considered the most beautiful and peaceful of the large Gouramis. They feature a 'mosaic' of iridescent spots and a distinct black line running through the eye. Unlike their aggressive cousins (the Three-Spot Gourami), Pearls are generally gentle giants, though males can be territorial towards one another. They are thermophilic (love heat) and require floating plants to feel secure.