Known as the 'Peaceful Betta', Betta imbellis is a wild species closely related to Betta splendens. Unlike their highly aggressive domestic cousins, they can often be kept in pairs or carefully managed groups. They are native to blackwater swamps and require calm, tannin-stained water with plenty of cover. They are exceptionally prone to jumping.
Betta Imbellis At a Glance
Betta Imbellis Tank Requirements
Will Betta Imbellis fit in your tank?
Care guides tell you what Betta Imbellis needs, the next question is whether your tank can safely provide it. Test Betta Imbellis against your tank size, maintenance needs, and the fish you already keep before you buy.
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Betta Imbellis Water Parameters
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Betta Imbellis Temperament & Compatibility
Betta Imbellis Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Male
Males display vibrant blue/green iridescence on their flanks and a signature red crescent on the caudal fin. Though called 'peaceful', males will still spar. Multiple males can be kept together only in heavily planted tanks (75L+) where lines of sight are broken.
Differs in 2 traits from base species
Also known as: Male Imbellis, Standard
Female
Females are typically brownish-grey with subtle horizontal barring and lack the intense iridescence of males. They are very peaceful and can be kept in groups or alongside a male.
Differs in 2 traits from base species
Also known as: Female Imbellis
Betta Imbellis Care Guide Summary
The Betta Imbellis, scientifically known as Betta imbellis, belongs to the Anabantoids family group. Adults reach a maximum size of approximately 6 cm and have a compressed body shape with a moderate growth rate. Classified as mostly peaceful, 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 Imbellis requires a freshwater only aquarium with a minimum volume of 38 litres and a tank length of at least 45 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 5.5–7 and a general hardness of 1–10 dGH. A low water flow is preferred.
Due to its specialist needs, the Betta Imbellis is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Male and Female. 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 Imbellis Habitat Setup
When setting up an aquarium for the Betta Imbellis, 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 leaf litter or blackwater tannins to replicate their natural soft-water habitat, 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.
Betta Imbellis Compatibility Notes
Classified as mostly peaceful, the Betta Imbellis is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, ornamental shrimp are not safe companions and boisterous or fast-moving tankmates may cause this species undue stress. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Betta Imbellis Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Betta Imbellis.
10 Gallon Standard
15 Gallon Standard
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
Show 22 more tank sizes
Betta Imbellis Feeding & Diet Considerations
The Betta Imbellis 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.
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Frequently Asked Questions About Betta Imbellis
How big does Betta Imbellis get?
Betta Imbellis (Betta imbellis) typically reaches a maximum adult size of approximately 6 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Betta Imbellis need?
A minimum aquarium volume of 38 litres and a tank length of at least 45 cm are recommended for Betta Imbellis. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Betta Imbellis need?
Betta Imbellis thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 5.5 and 7, and a general hardness of 1–10 dGH. A low water flow is preferred.
Is Betta Imbellis peaceful or aggressive?
Betta Imbellis is classified as mostly peaceful with an aggression score of 3 out of 10. They are generally well-suited to peaceful community tanks.
Can Betta Imbellis live alone?
Yes, Betta Imbellis can be kept singly or in a group. They are flexible and adapt well to both setups.
Is Betta Imbellis safe with shrimp?
No. Betta Imbellis 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 Imbellis have any special tank requirements?
Yes. Betta Imbellis benefits from plants - densely covered, plants - floating, and leaf litter/blackwater in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Betta Imbellis need a lid on the tank?
Yes. Betta Imbellis 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.
Top Tank Mates for Betta Imbellis
These fish are strong compatibility matches for Betta Imbellis based on water preferences, temperament, adult size, and tank behavior.
Common Whiptail Catfish
Rineloricaria eigenmanni
Ideal Tank MatesCommon Synodontis (False Upside Down Catfish)
Synodontis nigrita
Ideal Tank MatesBumblebee Catfish (South American)
Microglanis iheringi
Ideal Tank MatesApistogramma Resticulosa Marmor
Apistogramma cf. resticulosa "Marmor"
Ideal Tank MatesApistogramma Marmor (Marbled Apisto)
Apistogramma erythrura
Ideal Tank MatesGolden Bristlenose Pleco
Ancistrus sp. L144
Ideal Tank MatesPlants That Suit Betta Imbellis
These plants pair well with Betta Imbellis based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Amazon Frogbit
Limnobium laevigatum
Asian Watergrass
Hygroryza aristata
Asian Watermoss
Salvinia cucullata
Carolina Mosquito Fern
Azolla caroliniana
Common Duckweed
Lemna minor
Crystalwort
Riccia fluitans
Fish Similar to Betta Imbellis
Betta Smaragdina
Betta smaragdina
A beautiful wild-type Betta species native to the Khorat Plateau of Thailand, known for its striking iridescent emerald-green scales. Unlike the domestic Betta splendens, they are slightly more peaceful and closely resemble their natural wild form. They are excellent jumpers and require tight-fitting lids.
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.
Chocolate Gourami
Sphaerichthys osphromenoides
A delicate, highly specialized labyrinth fish native to the peat swamp forests of Southeast Asia. Known for its rich chocolate-brown coloration and vertical cream bands. It is notorious for being sensitive to water quality fluctuations and requires extremely soft, acidic 'blackwater' to thrive and resist bacterial infections. Best kept in a heavily planted, mature species-only setup or with very peaceful, small nano fish.
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.
Betta (Siamese Fighting Fish)
Betta splendens
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+).
Betta Macrostoma
Betta macrostoma
Known as the 'Brunei Beauty', Betta macrostoma is a large, highly sought-after wild mouthbrooding Betta. They possess a massive mouth and are voracious predators. Native to highly acidic, soft blackwater streams in Borneo, they require cool, pristine water to thrive. They are extremely prone to jumping and require a tight-fitting lid.