A massive, powerful apex predator native to the Amazon basin. Known for their striking colors and explosive feeding strikes, Peacock Bass require enormous aquariums and heavy filtration. As dedicated piscivores, they will consume any fish small enough to fit in their cavernous mouths.
Peacock Bass Monoculus At a Glance
Peacock Bass Monoculus Tank Requirements
Will Peacock Bass Monoculus fit in your tank?
Care guides tell you what Peacock Bass Monoculus needs, the next question is whether your tank can safely provide it. Test Peacock Bass Monoculus against your tank size, maintenance needs, and the fish you already keep before you buy.
Useful setup supplies
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Peacock Bass Monoculus Water Parameters
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Peacock Bass Monoculus Temperament & Compatibility
Peacock Bass Monoculus Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard (Adult)
Fully grown adult. Requires a massive custom aquarium and pristine water conditions. Cannot be kept with anything that can fit in its mouth. Often kept singly or in groups with other similarly sized monster fish.
Same care requirements as the base species
Also known as: Adult Mono, Full Grown Peacock Bass
Juvenile (Grow-out)
Young Peacock Bass typically sold around 3-4 inches. Do not be fooled by their sale size; they grow extremely quickly and will soon require a massive aquarium upgrade.
Differs in 5 traits from base species
Also known as: Baby Peacock Bass, Juvenile Mono, Fingerling
Peacock Bass Monoculus Care Guide Summary
The Peacock Bass Monoculus, scientifically known as Cichla monoculus, belongs to the Cichlids - South American family group. Adults reach a maximum size of approximately 60 cm and have a fusiform body shape with a fast growth rate. Classified as aggressive, this species primarily occupies the surface and mid-level zones of the aquarium and produces a extreme level of biological waste.
To thrive, the Peacock Bass Monoculus requires a freshwater only aquarium with a minimum volume of 1000 litres and a tank length of at least 240 cm. Water temperature should be maintained between 24°C and 29°C, with a pH range of 5.5–7.5 and a general hardness of 2–15 dGH. A moderate water flow is preferred.
Due to its specialist needs, the Peacock Bass Monoculus is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Standard (Adult) and Juvenile (Grow-out). 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.
Peacock Bass Monoculus Habitat Setup
When setting up an aquarium for the Peacock Bass Monoculus, a moderate 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 a sand substrate to accommodate their sifting behaviour and driftwood, which can serve as both a hiding place and a dietary supplement. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Peacock Bass Monoculus Compatibility Notes
Classified as aggressive, the Peacock Bass Monoculus is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, territorial behaviour may cause issues if hiding spots or floor space are limited, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Feeding products
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Frequently Asked Questions About Peacock Bass Monoculus
How big does Peacock Bass Monoculus get?
Peacock Bass Monoculus (Cichla monoculus) typically reaches a maximum adult size of approximately 60 cm. They have a fusiform body shape and a fast growth rate.
What tank size does Peacock Bass Monoculus need?
A minimum aquarium volume of 1000 litres and a tank length of at least 240 cm are recommended for Peacock Bass Monoculus. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Peacock Bass Monoculus need?
Peacock Bass Monoculus thrives in freshwater only conditions with a temperature range of 24–29°C, a pH between 5.5 and 7.5, and a general hardness of 2–15 dGH. A moderate water flow is preferred.
Is Peacock Bass Monoculus peaceful or aggressive?
Peacock Bass Monoculus is classified as aggressive with an aggression score of 8 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Peacock Bass Monoculus live alone?
Yes, Peacock Bass Monoculus can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Peacock Bass Monoculus have any special tank requirements?
Yes. Peacock Bass Monoculus benefits from sand (sifters) and driftwood (digestion/hiding) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Peacock Bass Monoculus need a lid on the tank?
Yes. Peacock Bass Monoculus 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.
Plants That Suit Peacock Bass Monoculus
These plants pair well with Peacock Bass Monoculus based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
African Onion Plant
Crinum calamistratum
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anubias Barteri
Anubias barteri
Ashy Pipewort
Eriocaulon cinereum
Balansae
Cryptocoryne crispatula
Fish Similar to Peacock Bass Monoculus
Peacock Bass Temensis
Cichla temensis
The undisputed king of the Peacock Bass family and one of the largest cichlids in the world. Native to the Amazon basin, they are apex open-water predators. In the aquarium hobby, they are true 'monster fish' requiring massive, custom-built tanks or indoor ponds and exceptional filtration due to their enormous bioload and strictly piscivorous diet.
Peacock Bass Orinocensis
Cichla orinocensis
A massive, highly predatory South American cichlid native to the Orinoco and Rio Negro basins. Famous for its vibrant coloration and three distinct circular rosettes (ocelli) on its sides. They grow extremely fast and require enormous aquariums with heavy filtration. They are apex predators that will consume any fish that fits into their large mouths.
Peacock Bass Ocellaris
Cichla ocellaris
A massive, incredibly fast-swimming predatory cichlid native to South America. Known for their striking colors and voracious appetite, they are strictly for advanced 'monster fish' keepers. They possess highly expandable mouths and will eat absolutely any fish that fits inside. Despite their predatory nature, they are generally not aggressive towards tank mates they cannot swallow.
Largemouth Bass
Micropterus salmoides
An iconic North American game fish occasionally kept by 'monster fish' enthusiasts. They are highly intelligent, robust, and voracious apex predators with cavernous mouths capable of swallowing surprisingly large prey. Because of their massive adult size, rapid growth, and heavy bioload, they are strictly suited for massive custom aquariums or indoor/outdoor ponds.
Freshwater Shark (Wallago)
Wallago attu
An apex predator native to South and Southeast Asia, infamous for its immense size, huge mouth, and voracious predatory nature. It will consume any tank mate that fits into its capacious mouth and is known to bite aggressively when handled. This species is utterly unsuitable for standard home aquariums and requires an enormous custom pond or public aquarium setup.
Peacock Cichlid (Aulonocara)
Aulonocara sp.
Endemic to Lake Malawi, Peacock Cichlids are highly sought after for the breathtaking colors of the males. They are benthivorous, using sensory pores on their jaws to hunt small invertebrates in the sand. While territorial, they are generally peaceful compared to their aggressive Mbuna cousins. They require hard, alkaline water and a sandy substrate to prevent gill damage while sifting.