Black Acara
Cichlasoma bimaculatum
A hardy, adaptable, and robust South American cichlid. They are relatively peaceful compared to larger cichlids but become highly territorial when breeding. Known for their oval-shaped body, greyish-green coloration, and a distinct black mid-lateral spot. They naturally sift through the substrate and require sandy bottoms.
Black Acara At a Glance
Black Acara Tank Requirements
Will Black Acara fit in your tank?
Care guides tell you what Black Acara needs, the next question is whether your tank can safely provide it. Test Black Acara against your tank size, maintenance needs, and the fish you already keep before you buy.
Black Acara Water Parameters
Black Acara Temperament & Compatibility
Black Acara Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard (Unsexed)
The standard commercial presentation. Commonly sold as juveniles before definitive sexual dimorphism develops. Keep singly, or as a mated pair if tank size permits.
Differs in 1 trait from base species
Also known as: Juvenile
Male
Adult males grow slightly larger and develop more extended, pointed dorsal and anal fins. They are the primary defenders of the territory.
Differs in 3 traits from base species
Also known as: Adult Male, Bull
Female
Females are slightly smaller, stockier in the belly area, and possess more rounded fins compared to males. Marginally less aggressive outside of spawning.
Differs in 3 traits from base species
Also known as: Adult Female
Black Acara Care Guide Summary
The Black Acara, scientifically known as Cichlasoma bimaculatum, belongs to the Cichlids - South American family group. Adults reach a maximum size of approximately 15 cm and have a compressed body shape with a moderate growth rate. Classified as semi-aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a high level of biological waste.
To thrive, the Black Acara requires a freshwater only aquarium with a minimum volume of 115 litres and a tank length of at least 80 cm. Water temperature should be maintained between 22°C and 28°C, with a pH range of 6–7.5 and a general hardness of 4–15 dGH. A low water flow is preferred.
Due to its specialist needs, the Black Acara is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 3 varieties: Standard (Unsexed), 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.
Black Acara Habitat Setup
When setting up an aquarium for the Black Acara, a low water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour, smooth gravel or rounded substrate to protect their sensitive barbels, and driftwood, which can serve as both a hiding place and a dietary supplement. Keepers should note that expect substrate disturbance, so lightweight décor should be secured.
Black Acara Compatibility Notes
Classified as semi-aggressive, the Black Acara is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, territorial behaviour may cause issues if hiding spots or floor space are limited. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Who Black Acara Is Actually For
Black Acara is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially sand.
The most common mistake is treating Black Acara like any other community fish and skipping the soft sand it needs to forage safely. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.
Black Acara Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Black Acara.
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
Show 10 more tank sizes
Frequently Asked Questions About Black Acara
How big does Black Acara get?
Black Acara (Cichlasoma bimaculatum) typically reaches a maximum adult size of approximately 15 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Black Acara need?
A minimum aquarium volume of 115 litres and a tank length of at least 80 cm are recommended for Black Acara. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Black Acara need?
Black Acara thrives in freshwater only conditions with a temperature range of 22–28°C, a pH between 6 and 7.5, and a general hardness of 4–15 dGH. A low water flow is preferred.
Is Black Acara peaceful or aggressive?
Black Acara is classified as semi-aggressive with an aggression score of 6 out of 10. They can work in community setups but may clash with certain tankmates.
Can Black Acara live alone?
Yes, Black Acara can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Black Acara have any special tank requirements?
Yes. Black Acara benefits from sand (sifters), driftwood (digestion/hiding), and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Useful setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 1, 2026
- Last updated
- May 1, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Black Acara
These plants pair well with Black Acara 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 Black Acara
Blue Acara
Andinoacara pulcher
A stunning and relatively peaceful South American cichlid. While they possess classic cichlid traits—such as digging and territoriality during breeding—they are generally far more tolerant of tank mates than their larger cousins (like the Green Terror). They will, however, eagerly consume any fish small enough to fit in their mouths (like Neon Tetras).
Port Acara
Cichlasoma portalegrense
The Port Acara is a hardy, medium-sized South American cichlid. Known for being relatively peaceful compared to other cichlids of its size, it makes an excellent entry-level cichlid for community tanks with appropriately sized tank mates. They display subtle but beautiful iridescent green and blue spangling. During breeding, they become territorial and will dig pits in the substrate, potentially uprooting unsecured plants.
Yellow Acara
Aequidens metae
A medium-sized, relatively peaceful South American cichlid native to the Meta River basin. They possess a yellowish-brown body with distinct dark vertical barring and iridescent spangling. While less aggressive than many other cichlids, they are territorial, especially during spawning, and will readily consume fish small enough to fit in their mouths.
Platinum Acara
Andinoacara latifrons
A striking, medium-sized South American cichlid known for its broad forehead and platinum-blue iridescence. Often confused with the standard Blue Acara in the aquarium trade. They are relatively peaceful for cichlids but become aggressively territorial when forming pairs and spawning. They are open-substrate spawners that appreciate sandy bottoms and driftwood.
Red Breasted Acara
Laetacara dorsigera
A peaceful and colorful dwarf cichlid native to the Amazon and Paraná River basins. Known for the stunning purple/red belly and face they develop, particularly when in spawning condition. Unlike many cichlids, they are relatively gentle and plant-safe, making them excellent centerpieces for community aquariums. They are exceptionally tolerant of cooler water temperatures.
Checkerboard Cichlid
Dicrossus filamentosus
A striking, slender South American dwarf cichlid known for its distinct black checkerboard pattern along its flanks. Unlike many cichlids, they are exceptionally peaceful community fish. They are strict blackwater species, requiring very soft, acidic water, sand substrate, and leaf litter to thrive.