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Leafy Filefish (Chaetodermis penicilligerus)

Leafy Filefish

Chaetodermis penicilligerus
Family
Filefish / Monacanthidae
Care level
Advanced
Temperament
Peaceful
Reef safe
Not reef safe
Max size
25 cm
Min tank
400 L · 106 gal
Origin
Indo-Pacific
Diet
Omnivore
Food
Mysis, Brine shrimp, Marine pellets, Nori, Live foods as needed

Overview

The Leafy Filefish is an extraordinary-looking fish covered in leaf-like skin appendages that provide remarkable camouflage among seaweed, soft coral, and algae, making it look almost nothing like a typical aquarium fish. Its unusual appearance and slow, drifting swimming style give it a lot of visual interest, but it's a genuinely challenging species to keep well.

It can be a selective and sometimes reluctant feeder in captivity, occasionally requiring live foods initially to establish feeding, and its natural diet includes coral polyps and other sessile invertebrates that make it fundamentally incompatible with a reef tank.

Given its specialised feeding needs and coral-eating tendencies, this is a fish best suited to experienced keepers with a fish-only or macroalgae-focused system, and buyers should have a realistic feeding plan before purchase.

Compatibility

Leafy Filefish are peaceful toward other fish and rarely show aggression, generally coexisting well with community tankmates in a non-reef setting.

This species is not reef safe — it will eat coral polyps, soft coral, and other sessile invertebrates in the wild, and individuals in captivity often continue this feeding behaviour if given the opportunity, making it unsuitable for a coral display.

Health & quarantine

This species carries genuine feeding risk in captivity, and a minimum four-to-six-week quarantine with careful feeding trials is strongly recommended. Buying only from a supplier who has confirmed the specific fish is already eating prepared foods significantly reduces the risk of prolonged feeding difficulty and decline.

Frequently asked questions

Is the Leafy Filefish reef safe?
No, it will eat coral polyps and other sessile invertebrates, making it unsuitable for reef tanks.
Why is the Leafy Filefish considered difficult?
It can be a selective feeder in captivity, sometimes needing live foods to establish feeding before transitioning to prepared foods.
What should I check before buying a Leafy Filefish?
Confirm with the supplier that the specific fish is already eating prepared foods before purchase.
How big does a Leafy Filefish get?
Up to around 25cm, requiring a fairly large tank.
Is the Leafy Filefish suitable for beginners?
No, its feeding challenges and coral-eating tendencies make it best suited to experienced keepers with a non-reef system.

Care guidance is drawn from our own experience — every fish is an individual, so treat it as a starting point, not a guarantee. Not sure if a species suits your tank? Come ask us in store. New to the terms? Read the care-terms glossary.