A highly popular, hardy, and relatively small suckermouth catfish. Excellent algae eaters that stay much smaller than Common Plecos, making them suitable for standard aquariums. They require dietary wood (driftwood) to aid in digestion and plenty of hiding caves.
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 (Standard / Color Morphs)
Males develop impressive, fleshy tentacles (bristles) on their snout and head. While peaceful to other species, males are highly territorial over caves and breeding sites. Keep only one male unless the aquarium is large (150L+) with broken sightlines.
Differs in 2 traits from base species
Also known as: Male, Standard, Wild Type, Albino, Super Red, Calico
Female
Females generally lack the prominent head bristles (though some may develop small nubs around the lip margin). They are peaceful towards each other and can be kept in groups or alongside a single male.
Differs in 3 traits from base species
Also known as: Female, Girl, Smooth Snout
Longfin Morph
A selectively bred variant featuring long, flowing fins. They require gentler flow to prevent exhaustion and snag-free decor. Avoid keeping with known fin-nippers.
Differs in 3 traits from base species
Also known as: Longfin, Veiltail, Long Finned Bristlenose
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🟢Ideal Tank MatesBristlenose Pleco Care Guide Summary
The Bristlenose Pleco, scientifically known as Ancistrus cirrhosus, belongs to the Catfish family group. Adults reach a maximum size of approximately 13 cm and have a depressed body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the bottom zone of the aquarium and produces a extreme level of biological waste.
To thrive, the Bristlenose Pleco requires a freshwater only aquarium with a minimum volume of 75 litres and a tank length of at least 60 cm. Water temperature should be maintained between 22°C and 27°C, with a pH range of 6–7.5 and a general hardness of 4–15 dGH. A moderate water flow is preferred. An aquarium test kit can help you monitor these values.
The Bristlenose Pleco is a rewarding species to keep, provided its core environmental needs are met. This species is available in 3 varieties: Male (Standard / Color Morphs), Female, and Longfin Morph. 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.
Bristlenose Pleco Habitat Setup
When setting up an aquarium for the Bristlenose Pleco, a moderate water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include driftwood, which can serve as both a hiding place and a dietary supplement and an established tank with natural algae growth, as they depend on it as a primary food source.
Bristlenose Pleco Compatibility Notes
Classified as peaceful, the Bristlenose Pleco is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Bristlenose Pleco.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
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Frequently Asked Questions About Bristlenose Pleco
How big does Bristlenose Pleco get?
Bristlenose Pleco (Ancistrus cirrhosus) typically reaches a maximum adult size of approximately 13 cm. They have a depressed body shape and a moderate growth rate.
What tank size does Bristlenose Pleco need?
A minimum aquarium volume of 75 litres and a tank length of at least 60 cm are recommended for Bristlenose Pleco. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Bristlenose Pleco need?
Bristlenose Pleco thrives in freshwater only conditions with a temperature range of 22–27°C, a pH between 6 and 7.5, and a general hardness of 4–15 dGH. A moderate water flow is preferred.
Is Bristlenose Pleco peaceful or aggressive?
Bristlenose Pleco is classified as peaceful with an aggression score of 2 out of 10. They are generally well-suited to peaceful community tanks.
Can Bristlenose Pleco live alone?
Yes, Bristlenose Pleco can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Bristlenose Pleco have any special tank requirements?
Yes. Bristlenose Pleco benefits from driftwood (digestion/hiding) and established algae (otocinclus) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Similar Species
Common Pleco
Hypostomus plecostomus
A heavily armored, nocturnal catfish famous for eating algae. However, they grow incredibly large, produce massive amounts of waste, and frequently outgrow standard aquariums. They require driftwood in their diet for digestion. As they age, they may become territorial or develop a taste for the slime coat of slow-moving, flat-bodied tank mates.
Otocinclus
Otocinclus vittatus
A small, peaceful, and highly popular algae-eating catfish native to South America. They are obligate shoaling fish that thrive in mature, heavily planted aquariums with steady water parameters and a constant supply of soft green algae and biofilm. They are extremely sensitive to uncycled or pristine/new tanks without natural food sources.
Chinese Algae Eater (CAE)
Gyrinocheilus aymonieri
Sold widely as a small, peaceful algae-eating juvenile, the Chinese Algae Eater (CAE) undergoes a drastic behavioral and dietary shift as it matures. Growing up to 25cm (10 inches), adults stop eating algae, become highly territorial, and are notorious for attacking slow-moving, flat-sided fish (like Angelfish, Discus, and Goldfish) to feed on their nutrient-rich slime coat. Best kept in fast-flowing river setups with robust, fast-moving tank mates.
Zebra Pleco (L046)
Hypancistrus zebra
A highly sought-after, strikingly beautiful black-and-white striped pleco endemic to the fast-flowing Xingu River in Brazil. Unlike common plecostomus, it is primarily carnivorous (a micropredator) and will not clean algae. They are notoriously shy, slow-growing, and require highly oxygenated, warm water with vigorous flow to thrive.
Royal Pleco (L190)
Panaque nigrolineatus
A stunning, large-growing pleco famous for its red eyes, grey/green coloration, and dark horizontal stripes. Belonging to the genus Panaque, they are xylophagous (obligate wood-eaters); real driftwood in the aquarium is absolutely essential for their digestion and survival. They produce extreme amounts of sawdust-like waste and require heavy, high-flow filtration.
Whiptail Catfish
Rineloricaria sp.
A highly cryptic, peaceful, and extremely slender catfish that mimics a twig or dead leaf. They are excellent scavengers and biofilm grazers that require smooth sand and driftwood to thrive. They are completely non-aggressive, lack the heavy armor of larger plecos, and do well in peaceful community setups.