Freshwater Fiddler Crab
Uca species
Freshwater Fiddler Crab (Uca species) — Intermediate care, Semi-aggressive, under Other. Minimum tank in the app: 10.6 US gal min; aim for 72–82°F and pH 7.5–8.5. Details below match the app.
Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
Various
We don’t shade a region on this simplified map—your text may be Europe-only, worldwide, listed as “Various,” captive-only, or outside the five areas used in the stocking calculator. That tool still scores whether your fish come from similar parts of the world.
Regional colours match the stocking calculator’s origin map.
Freshwater Fiddler Crab Tank Setup
Plan for at least 10.6 US gal min of water—that is the minimum in our database for a workable setup, not a challenge to crowd fish. Aim to hold 72–82°F and pH 7.5–8.5 without daily drama. These fish use the Bottom/land zone most, so put wood, plants, or open water there accordingly.
What Do Freshwater Fiddler Crabs Eat?
We record diet as Omnivore (detritivore). Offer a few food types that match—dry, frozen, or gel—and swap now and then. One flake every day for a year is how dull color and gut trouble creep in.
Freshwater Fiddler Crab Tank Mates
Temperament in the data: Semi-aggressive. Treat small tank mates as potential snacks once the fish grows. Semi-terrestrial; requires paludarium setup with land access. Brackish conditions preferred. Will eat small invertebrates. Plug your full stock list into the stocking calculator—single-species compatibility scores are hints, not a whole-tank verdict.
Are Freshwater Fiddler Crabs Good for Beginners?
We rate this as intermediate. Budget time for testing, maintenance, and watching behaviour if the water looks fine but the fish do not. If this would be your very first tank, start with something more forgiving and come back to this one.
Building a community? Run the full list through the stocking calculator before you add anything else.
Similar fish to consider
Log tests and reminders in App-aquatic—free, same data you see here.