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Fish Freshwater Care: easy Peaceful

Ancistrus multispinis

Ancistrus multispinis
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Other names: Bristlenose pleco, Bristlenose catfish
Group: Plecos and suckermouth catfish · Family: Loricariidae · Origin: South America — Atlantic coastal streams of southeastern and southern Brazil

A dark-colored bristlenose reaching 14 cm, from the streams of Brazil's Atlantic coast. Like the common bristlenose it is easy to keep; it needs clean, well-oxygenated water and a mainly vegetable diet.

Will it suit my tank?

Last updated October 16, 2026

Temperature
21–26°C
pH
6–7.5
Hardness
2–12 dGH
Adult size
14 cm
Minimum tank size
100 liters
Social structure
Solitary
Swimming zone
Bottom
Diet
Herbivore
Breeding
Substrate spawner

Water parameters

Temperature21–26°C
pH6–7.5
General hardness (GH)2–12 dGH
Recommended range
Considered shrimp safe Suitable for planted tanks

Overview

October 16, 2026 · Suggest an edit

Ancistrus multispinis is a bristlenose that lives in the Atlantic coastal streams of Brazil stretching from Rio de Janeiro to Rio Grande do Sul. It looks similar to the common bristlenose, but its range lies further south and its temperature values are somewhat lower. Its standard length reaches up to 14 cm.

Academic studies on rearing the fry of this species have also been carried out in Türkiye. It is easy to keep and breeds readily in the aquarium.

Tank Setup

October 16, 2026 · Suggest an edit
  • 100 liters for one or two fish.
  • Roots, caves and flat stones; males claim caves.
  • 22–25°C, clean and well-oxygenated water; moderate flow.

Diet

October 16, 2026 · Suggest an edit

Mainly herbivorous. Make vegetable and spirulina tablets, blanched zucchini, cucumber and spinach the staple; bloodworms can be given once a week. It rasps on roots. The algae in the aquarium is not enough on its own.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

Peaceful; it leaves other fish and shrimp alone. Males chase each other over caves. It is more active at night, but is also seen during the day once settled.

Good companions: Community fish that like temperate water: tetras, rasboras, danios, corydoras, shrimp.

Avoid: Large cichlids that claim the bottom, species that need very warm water such as discus.

A short profile for this species

The Ancistrus multispinis page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Usually compatible

Should not be kept together

Hobbyist notes

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Change history and contributors
  1. Page created · October 16, 2026