Species profile
Red Hook Silver Dollar
Myloplus rubripinnis
Peaceful
Moderate care
700 L minimum aquarium
20–30 cm adult size
Midwater
Minimum group: 6
About this species
General notes for hobby use.
Very large shoaling silver dollar with a conspicuous red anal fin; adult groups need at least a 180 × 60 cm footprint.
Water parameters
Suggested general range for long-term care.
Temperature
23–27 °C
pH
5–7
GH
Up to 15 dGH
KH
Not yet documented
Flow preference
Moderate
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 6
Tank zone
Midwater
Territory level
None
Predation risk
Tiny fry
Bioload factor
3.2
Generally peaceful but powerful and easily startled. Keep in a group and provide clear swimming lanes plus a tight lid.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Caution
Shrimp safe
No / caution
Snail safe
Yes
Cave breeder
No
Digs substrate
No
Jump risk
Yes
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
Not yet documented
Diet type
Herbivore
Minimum aquarium volume
700 L
Minimum footprint
180 × 60 cm
Accepted scientific name
Myloplus rubripinnis
Alternative names
Redhook Myleus, Red Hook Silver Dollar
Native range
Northern and central tropical South America, including Amazon and Orinoco-associated drainages.
Natural habitat
River and floodplain habitats; captive groups benefit from open swimming space, subdued shelter and good oxygenation.
Diet & feeding
Predominantly herbivorous; offer abundant vegetable foods and expect most soft plants to be grazed.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Sexual differences are subtle; mature males may show more pronounced anal-fin shape/colour.
Breeding
Captive spawning is poorly documented in normal home aquaria; do not present routine breeding claims as established.