American Flagfish (2.5–3 cm) – a vibrant freshwater fish with patriotic red, blue, and green patterns. Great algae eater for planted tanks and peaceful setups.

The American Flagfish (Jordanella floridae) is a colorful freshwater fish native to Florida and the southeastern United States. It is named for its unique pattern of red stripes and blue-green spots, resembling the stars and stripes of the American flag. At 2.5–3 cm, these juveniles make an excellent addition to community aquariums and planted tanks, offering both beauty and functionality as natural algae eaters.

Known for their hardiness, vibrant colors, and algae-eating capabilities, American Flagfish are ideal for aquarists looking to add a peaceful yet active species that helps maintain tank cleanliness.

✅ Key Features

• Size: 2.5–3 cm juvenile; adults reach 6–7 cm

• Temperament: Semi-peaceful; can be nippy in tight spaces

• Care Level: Easy to moderate

• Lifespan: 3–5 years in ideal conditions

• Special Trait: Patriotic coloration resembling the American flag

Care Guide for American Flagfish

✅ Tank Requirements

• Minimum Tank Size: 40 liters (10 gallons) for a small group

• Aquascape: Planted tanks with open swimming areas and hiding spots

• Lighting: Moderate to bright lighting for plant growth and color display

• Lid: Recommended to prevent jumping

✅ Water Parameters

• Temperature: 20°C – 26°C (68°F – 79°F)

• pH Level: 6.5 – 8.0

• Water Hardness: 6 – 20 dGH

• Maintenance: Weekly water changes (20–30%) for stable conditions

American Flagfish are adaptable but prefer clean, well-oxygenated water with moderate flow.

✅ Feeding Habits

American Flagfish are omnivores with a strong preference for algae.

• Recommended Diet:

  • Algae and biofilm in the tank

  • High-quality flake or pellet food

  • Vegetable-based foods (blanched spinach, zucchini)

  • Occasional protein (bloodworms, brine shrimp)

Feed once or twice daily, ensuring not to overfeed.

✅ Tank Mates

Flagfish can be semi-aggressive in small tanks, especially males, so choose tank mates carefully.

Ideal Companions:

• Livebearers (Platies, Mollies)

• Small barbs and tetras

• Corydoras catfish

• Snails (bonus: helps control algae together)

Avoid slow-moving or long-finned fish (e.g., Bettas, Angelfish) as fin-nipping can occur.

✅ Behavior & Breeding

• Behavior: Active swimmers, often grazing on algae throughout the day

• Breeding: Egg layers; males display vivid colors during spawning

• Care Tip: Provide spawning mops or dense vegetation for egg protection

Why Choose American Flagfish?

• Brilliant red, blue, and green coloration for a patriotic display

• Excellent natural algae control for planted tanks

• Hardy, beginner-friendly fish

• Active and interesting behavior for community aquariums

✅ Ideal for aquarists seeking functional beauty in their tanks
✅ Perfect for nano and mid-sized planted aquariums