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Red Hook Silver Dollar
Myloplus rubripinnis
📍 South America
The Red Hook Silver Dollar is a medium-sized, schooling fish known for its distinctive red coloration on the lower fins and tail. These peaceful omnivores are popular in community aquariums and prefer to be kept in groups where they display natural schooling behavior. They are relatively hardy and adaptable, making them suitable for intermediate aquarists.
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Care Guide
Diet
Red Hook Silver Dollars are omnivorous and should be fed a varied diet including high-quality flake foods, pellets, and vegetable matter such as blanched spinach or spirulina. Supplement with small live or frozen foods like daphnia and bloodworms 2-3 times weekly. Feed once or twice daily in amounts they can consume within 2-3 minutes.
Behavior
These fish are highly social and exhibit strong schooling behavior, becoming stressed and aggressive when kept in small groups or isolation. They are active swimmers that prefer open water in the middle column and appreciate plants around tank perimeters for security. They are generally peaceful with similarly-sized fish but may nip at slower-moving species or those with trailing fins.
Breeding
Breeding in captivity is challenging and rarely successful in home aquariums. They require very large tanks (200+ gallons), soft acidic water, and specific seasonal triggers to spawn. Fry are difficult to raise and require specialized foods and careful water management.
Tank Mates
Small peaceful fish that occupy different water zones
Similar size and peaceful temperament, good community fish
Bottom dweller that doesn't compete for space or food
Peaceful algae eater that occupies bottom zone
Peaceful schooling fish with similar water requirements
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, rubbing against objects, lethargy
Raise temperature to 28-30°C (82-86°F), perform daily 25% water changes, use aquarium salt at 1 teaspoon per 5 gallons, or use ich-specific medication for 7-10 days
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, fin loss
Improve water quality with frequent water changes, remove any sharp decorations, treat with antibacterial medication, ensure adequate aeration and filtration
Columnaris (Flexibacter columnaris)
White or grayish film on body, mouth rot, fin deterioration, lethargy, loss of appetite
Perform 50% water change immediately, treat with antibiotic medication, increase aeration, maintain water temperature at 26-28°C (79-82°F), isolate affected fish if possible
Parasitic Infections
Excessive scratching, visible parasites, clamped fins, weight loss, behavioral changes
Treat with antiparasitic medication, perform frequent water changes, quarantine new fish before adding to main tank, maintain optimal water parameters
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Quick Facts
- diet
- omnivore - feeds on plant matter, small insects, and algae-based foods
- lifespan
- 5-8 years
- max size
- 9 cm (3.5 in)
- tank size
- 75 gallons minimum
- temperament
- peaceful
Water it likes
- ph
- 6.0-7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 4-8 dGH
- temperature
- 75–82°F (24–28°C)