American Flag Fish

American Flag FishThe American Flag Fish (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. American Flag Fish 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

The American Flag Fish (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.

American Flag Fish 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:

American Flag Fish 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