American Flagfish (Jordanella floridae)

The American Flagfish is a uniquely patterned freshwater fish named for its red, white, and blue coloration that resembles the American flag. Native to Florida and other parts of the southeastern United States, this peaceful yet lively species is well-loved for its algae-eating abilities and striking appearance.

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? Quick Facts

• Common Name: American Flagfish

• Scientific Name: Jordanella floridae

• Origin: Florida, USA

• Size: 2–2.5 inches (5–6.5 cm)

• Lifespan: 3–5 years

• Temperament: Semi-aggressive to peaceful (varies by individual)

• Tank Level: Mid to top

• Minimum Tank Size: 20 gallons

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? Appearance

• Males display vivid colors, with green iridescence, vertical red bars, and a shimmering spot near the tail.

• Females are duller, with a more olive tone and a distinctive black spot near the shoulder.

• Both sexes have a flattened, oval body shape and rounded fins.

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? Water Parameters

• Temperature: 68–78°F (20–25.5°C)

• pH: 6.5–8.0

• Hardness: Moderate to hard

• Water Flow: Low to moderate

• Tank Setup: Slow-moving or still water with floating plants and vegetation

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? Tank Setup

• Substrate: Sand, fine gravel, or natural riverbed-style substrate

• Decor: Rocks, driftwood, and plants provide cover and reduce stress

• Plants: Excellent for planted tanks — can help control algae naturally

• Lighting: Moderate — enhances their iridescent coloration

• Lid: Recommended — active swimmers that can jump

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? Behavior & Compatibility

• Temperament: Varies — some are peaceful, others can be nippy, especially toward long-finned fish

• Tankmates: Best with fast-moving, short-finned community fish like danios, tetras, mollies, or rainbowfish

• Avoid with: Fancy guppies, bettas, angelfish, or shrimp — they may nip or harass them

• Social Behavior: Can be kept singly or in pairs; males may show aggression toward each other without space

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?️ Diet

Flagfish are omnivores with a strong appetite for algae. In the wild, they graze constantly.

• Staple Foods: High-quality flake or pellet food

• Vegetable Matter: Blanched spinach, zucchini, or spirulina-based foods

• Protein: Frozen or live foods like bloodworms, brine shrimp, daphnia

• Algae: Will eat hair algae, surface film, and some types of green algae in the aquarium

Note: They can be nippy during feeding — spread food across the surface to reduce competition.

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? Breeding Behavior

• Spawning Style: Egg scatterers; prefer dense plants or moss to lay eggs

• Male Behavior: Will guard the eggs and defend territory

• Raising Fry: Remove adults post-spawn to prevent fry predation; feed infusoria or baby brine shrimp

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⚠️ Care Notes

• Algae Control: Excellent natural algae eaters, but not a substitute for poor tank maintenance

• Behavior Management: If aggression arises, rearrange décor or separate more dominant individuals

• Water Changes: Weekly 25–30% water changes recommended for health and clarity

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? Final Thoughts

The American Flagfish is a colorful and functional addition to a community tank — especially planted aquariums. They’re hardy, attractive, and helpful for algae control, though they can show mild aggression. With the right setup and tankmates, they’re a rewarding and patriotic pick for freshwater hobbyists.

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