American Flag Fish
The (Jordanella floridae) is a hardy and eye-catching freshwater fish native to Florida, USA. Named for its distinctive red, white, and blue patterning, this species is especially popular for its bold appearance and algae-eating behaviour.
are best suited to semi-aggressive or species-specific aquariums, as males can become territorial, particularly during breeding. They are adaptable, resilient fish that thrive in well-planted tanks and are well suited to aquarists looking for a unique, characterful species.
Physical Characteristics:
Adult Size: 5–6 cm
Body Shape: Short, robust body
Colouration:
Males display vibrant red, blue, and white striping
Females are duller with olive-brown tones
Sexual Dimorphism:
Males are more colourful and territorial
Females are larger and less brightly coloured
Lifespan: 3–4 years
Behaviour & Temperament:
Temperament: Semi-aggressive, especially males
Swimming Level: Mid to upper levels
Social Behaviour: Can be kept singly, in pairs, or small groups
Territoriality: Males may defend territory during breeding
Aquarium Requirements:
Minimum Tank Size: 60 litres
Water Temperature: 18–26°C
pH Range: 6.5–8.0
Water Hardness: 5–20 dGH
Water Flow: Moderate
Aquascape: Heavily planted with open swimming areas
Lighting: Moderate
Tank Cover: Recommended
Feeding:
are omnivorous with a strong appetite for algae:
Algae wafers and spirulina-based foods
High-quality flakes or pellets
Frozen foods such as brine shrimp and bloodworms
Occasional vegetable matter (blanched spinach, zucchini)
Feed once or twice daily in small amounts.
Compatibility:
Good Tank Mates:
Suitable Tank Mates:
Robust livebearers
Larger tetras
Rainbowfish
Other semi-aggressive community fish
Avoid Housing With:
Long-finned or slow-moving fish
Very peaceful or timid species
Special Considerations:
Males can be aggressive toward each other
Excellent algae grazers but may nibble soft plants
Best colour develops in well-fed, well-maintained tanks
Cooler water tolerance makes them versatile