American Flagfish
Jordanella floridae
American Flagfish (Jordanella floridae) — Varies care, Peaceful, under Other. Minimum tank in the app: 18.5 US gal min; aim for 63–73°F and pH 6.5–7.5. The American Flagfish appeals to aquarists who appreciate unique coloration and dynamic behaviour, making it a standout choice for a mid-level fish.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
North America
- Central America & Mexico
Regional colours match the stocking calculator’s origin map.
American Flagfish Tank Setup
Create a balanced environment that includes both open swimming space and plenty of hiding spots using plants and decorations. A substrate that mimics their natural habitat enhances their behaviour, while moderate flow and subdued lighting promote comfort and reduce stress.
What Do American Flagfishs Eat?
American Flagfish are omnivorous and can be competitive feeders, so offer a varied diet to mitigate aggression during feeding. Consider supplementing with high-quality flakes, frozen foods, and live options to encourage vibrant coloration and overall health, while ensuring all fish have access to food.
American Flagfish Tank Mates
Best suited with similarly-sized or slightly smaller fish that share a mid-level swimming zone, such as smaller tetras or rasboras. Avoid pairing with overly aggressive species or those that occupy the same niche, as this can lead to conflict. When kept in groups, ensure sufficient space to minimize territorial disputes, especially among males.
Are American Flagfishs Good for Beginners?
Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often underestimate their territorial nature, leading to overcrowding or incompatible tank mates. Failure to provide sufficient cover can result in stress, aggressive behaviour, and health issues.
Building a community? Run the full list through the stocking calculator before you add anything else.
Log tests and reminders in App-aquatic—free, same data you see here.




