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Fish Freshwater Care: hard Semi-aggressive

Adonis Pleco

Acanthicus adonis
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Other names: Polka dot lyretail pleco, Lyre-tail pleco, Acanthicus adonis
Group: Plecos and suckermouth catfish · Family: Loricariidae · Origin: South America — Rio Tocantins and the lower Amazon (Brazil)

Very cute as a juvenile with white polka dots on a black background and a long lyre-shaped tail, but a giant pleco that reaches 60 cm, and much more in the wild. It is suited not to home aquariums but to very large systems.

Will it suit my tank?

Last updated October 16, 2026

Temperature
24–29°C
pH
6–7.5
Hardness
2–15 dGH
Adult size
60 cm
Minimum tank size
1500 liters
Social structure
Solitary
Swimming zone
Bottom
Diet
Omnivore
Breeding
Substrate spawner

Water parameters

Temperature24–29°C
pH6–7.5
General hardness (GH)2–15 dGH
Recommended range
Eats shrimp Eats snails Suitable for planted tanks

Overview

October 16, 2026 · Suggest an edit

As a juvenile, the adonis pleco is one of the most eye-catching plecos in stores, with its white polka dots on a black background and its long-tipped, lyre-like tail. But this cute look is misleading: the spots fade and disappear with age, and the fish reaches 60 cm in the aquarium and, according to reported records, much more in the wild.

In the trade, dark-colored Acanthicus are often also sold under the number L155; which species this number belongs to is disputed.

Tank Setup

October 16, 2026 · Suggest an edit
  • At least 1500 liters and 300 cm length for one adult; public aquarium scale.
  • Very powerful sump filtration, frequent water changes.
  • Large, sturdy caves; it easily shifts decor around.

Diet

October 16, 2026 · Suggest an edit

Omnivorous. Pieces of fish, mussel and shrimp, krill, protein-rich sinking tablets and blanched vegetables should be given in rotation.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

It becomes territorial and rough as it grows; it may attack other plecos and bottom dwellers. Its spiny plates and fin spines can injure other fish.

Good companions: Only very large, robust fish: large cichlids, large characins (in a very large system).

Avoid: Home aquariums, other plecos, small and slow bottom dwellers, shrimp.

A short profile for this species

The Adonis Pleco 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