The Complete Guide to Keeping Fiddler Crabs
Fiddler Crabs care summary. Small semi-terrestrial crabs kept in a brackish paludarium (a tank with both land and slightly salty water). Use at least 60 litres for 3–5 crabs. Make 70–80% land and 20–30% shallow water no deeper than 5–8 cm. Provide 8–10 cm of fine sand or a sand–soil mix for burrows. Salinity (salt level) 1.005–1.015, temperature 22–28°C, pH 7.5–8.5. Humidity 70–90% and air temperature 24–28°C, use a tight lid and mist the land daily. Feed algae wafers, spirulina pellets, sinking crustacean pellets, vegetables and occasional protein. Keep at least 3 crabs with 1 male to 2–3 females and use a species-only tank. Do weekly 20–30% water changes, use a gentle sponge filter and provide hides and climbing decor. Support moulting with calcium and steady conditions. Lifespan about 2–3 years. Not suitable for simple freshwater tanks; they do well with a proper brackish setup.