Not furry, but we like them anyway.
Leaf Fish
Monocirrhus polyacanthus
Also called Amazon leaffish, South American leaffish
A peaceful but predatory fish that lies in wait for prey.
| Size | Tiny |
|---|---|
| Length | 8 to 10 cm (3 to 4 in)12 |
| Lifespan | 5 to 8 years345 |
| Coat | Scales |
| Origin | Amazon basin in Bolivia, Brazil, Colombia, Peru and Venezuela1 |
| Last checked | 2026-11-04 |
Personality what they are like
A peaceful but predatory fish that lies in wait for prey. It is nervous and easily stressed, so it needs a calm, quiet tank with plenty of hiding places. It is best kept alone or with larger, robust catfish that are too big to be eaten.75
The care rhythm a typical week and year
A typical home-care rhythm for a Leaf Fish. A starting point, not a vet's advice.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Water changeAbout 25% of the waterevery week
- Water testevery week
- Glass cleanevery week
- Filter rinseRinse in old tank water, never tap waterevery month
Looks how to spot one
scales
The body is flattened and shaped like a dead leaf, with a filament on the lower jaw that looks like a leaf stalk. It is grey-brown and can change colour slightly to blend in. There is no lateral line and the mouth is very large and can be pushed forward.16
Daily activity how busy a day looks
Low activity; it is an ambush predator that spends most of its time motionless, drifting like a leaf. The tank should have dim lighting and still water with little flow.57
Grooming and care the hands-on bits
Requires pristine water quality and minimal disturbance. Frequent water changes are needed, but hands-on interaction inside the tank should be kept to a minimum to avoid stress. A good external filter with gentle flow is recommended.73
Home where they are happiest
Soft, acidic water with pH 5.0-6.5, hardness below 8 dH, and temperature 22-28°C (72-82°F). The tank should have plenty of large-leafed plants, driftwood, and floating plants to provide shade and hiding spots. Water flow should be very gentle, mimicking still or sluggish waters.875
Food basics what goes in the bowl
Strictly carnivorous; it will only eat live prey such as small fish (e.g. guppies, neons) and live ghost shrimp. It is extremely difficult to wean onto frozen or prepared foods. Each fish needs at least three adult guppies per day to avoid starvation.357
Company who they like around
Best kept alone or with larger, slow-moving catfish that are too big to be eaten. It will eat any fish small enough to fit in its mouth. It is not suitable for a community tank with small fish.75
The story where it all began
The Amazon leaffish has been known to science since 1840 and has long been traded in the aquarium hobby because of its extraordinary leaf mimicry. It is not a common species in the wild and is considered a low-density fish. Its specialised diet and shy nature make it a challenging pet for experienced keepers only.167
Owner questions the things everyone asks
How often should I feed my Leaf Fish?
Feed your Leaf Fish once or twice a day, offering small amounts each time. Pet Wiki's starting plan suggests feeding daily. Each fish needs at least three adult guppies per day to avoid starvation.357 Pet Wiki plan
What does a Leaf Fish eat, and what should it never eat?
Leaf Fish are strict carnivores and will only eat live prey like small fish (e.g., guppies, neons) and live ghost shrimp. They are extremely difficult to wean onto frozen or prepared foods, so never offer those.357
How much space does a Leaf Fish need?
The exact tank size varies, but it needs a calm, quiet tank with plenty of hiding places. For specific space requirements, ask a good breeder or an exotic-pet vet.
What temperature, light or water does a Leaf Fish need?
Keep the water soft and acidic, with pH 5.0-6.5, hardness below 8 dH, and temperature 22-28°C (72-82°F). Use dim lighting and very gentle water flow, and add plenty of large-leafed plants, driftwood, and floating plants for shade.875
How often should I clean a Leaf Fish's home?
Pet Wiki's starting plan recommends a 25% water change every week, along with weekly glass cleaning and water testing. Rinse the filter in old tank water (never tap water) once a month. Keep hands-on interaction minimal to avoid stress.73 Pet Wiki plan
Can a Leaf Fish live with others?
Leaf Fish are best kept alone or with larger, slow-moving catfish that are too big to be eaten. They will eat any fish small enough to fit in their mouth, so they are not suitable for a community tank with small fish.75
How long does a Leaf Fish live?
A Leaf Fish typically lives between 5 and 8 years with proper care.345
Can I handle a Leaf Fish?
It's best not to handle your Leaf Fish. They are nervous and easily stressed, and hands-on interaction inside the tank should be kept to a minimum. Always avoid unnecessary disturbance.73
Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.
Where this comes from
Every fact on this page has a numbered source. Spotted an error? support@petwiki.app.
- en.wikipedia.org: Amazon leaffish en.wikipedia.orgused for origin, length cm, coat or body, colours, best traits, history, fun fact
- fishbase.se: 11015 fishbase.seused for length cm
- atlarium.bio: monocirrhus polyacanthus atlarium.bioused for lifespan years, grooming or care, diet basics
- buildyouraquarium.com: south american and african leaf fish species profiles buildyouraquarium.comused for lifespan years
- thesprucepets.com: south american leaffish 4065312 thesprucepets.comused for lifespan years, temperament, activity needs, habitat needs, diet basics, social needs
- scielo.br: KdbVBQVfcS8DTtGHkYtPpWJ scielo.brused for coat or body, best traits, history, fun fact
- practicalfishkeeping.co.uk: predators the leaf fish practicalfishkeeping.co.ukused for temperament, activity needs, grooming or care, habitat needs, diet basics, social needs, history
- tropicalfreshwaterfish.com: Monocirrhus polyacanthus tropicalfreshwaterfish.comused for habitat needs, fun fact
Checked 2026-11-04. Text is written in our own words from these sources.