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Fish Freshwater Care: medium Peaceful

Marbled Whiptail

Loricaria simillima
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Other names: Loricaria simillima, Loricaria, Whiptail catfish
Group: Plecos and suckermouth catfish · Family: Loricariidae · Origin: South America — Amazon basin

A whiptail reaching 20–25 cm that disappears into the sand with its sand-colored, marbled flat body and long caudal peduncle. The male carries the eggs under his lip; it needs a large sand substrate.

Will it suit my tank?

Last updated October 16, 2026

Temperature
23–28°C
pH
6–7.5
Hardness
2–12 dGH
Adult size
22 cm
Minimum tank size
200 liters
Social structure
Solitary
Swimming zone
Bottom
Diet
Omnivore
Breeding
Other

Water parameters

Temperature23–28°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

The marbled whiptail is a large whiptail that camouflages itself on sandy bottoms with its sand-colored body and dark marbled pattern. The pattern and color can vary depending on where it comes from. Sources give its length as between 18 and 26 cm, so it is not suitable for small aquariums.

As in other members of the genus Loricaria, the male carries the egg cluster under his lower lip and guards it until the fry hatch. For this reason it is also marketed in the trade as the "mouthbrooding whiptail".

Tank Setup

October 16, 2026 · Suggest an edit
  • At least 200 liters and 120 cm length for a small group.
  • A fine, soft sand substrate is essential; a large open bottom area.
  • 24–27°C, clean water, gentle to moderate flow.

Diet

October 16, 2026 · Suggest an edit

Omnivorous; it sifts the sand in search of small invertebrates. Frozen bloodworms, brine shrimp, sinking granules and vegetable tablets should be given in rotation.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

Calm and peaceful; it is also tolerant of its own kind. It can be kept in a small group.

Good companions: Calm, medium-sized fish: tetras, rainbowfish, corydoras, calm dwarf cichlids.

Avoid: Cichlids that claim the bottom, greedy large bottom dwellers, layouts with sharp gravel.

A short profile for this species

The Marbled Whiptail 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