Purple Vampire Crab (Geosesarma sp.) Care Guide
Purple Vampire Crabs are small, colorful, semi-terrestrial crabs best kept in a humid paludarium rather than a full aquarium, as they require both land and shallow freshwater access. They thrive in densely planted setups with plenty of hiding places such as cork bark, rocks, leaf litter, and moss, which also help maintain high humidity. These crabs are shy, mostly nocturnal, and can be kept in small groups if ample space and shelters are provided to reduce territorial disputes. A varied omnivorous diet of high-quality crab pellets, algae wafers, blanched vegetables, leaf litter, and occasional protein like bloodworms or brine shrimp supports good health and coloration. Stable warm temperatures, clean dechlorinated freshwater, and high humidity are essential for successful molting and long-term care.
Care Aspect
Recommendation
Scientific Name
Geosesarma sp.
Common Name
Purple Vampire Crab
Adult Size
~1–1.5 in (2.5–4 cm)
Enclosure Type
Paludarium (land-dominant)
Minimum Tank Size
10 gallons (larger for groups)
Temperature
72–82°F (22–28°C)
Humidity
70–90%
Water Type
Freshwater (shallow)
pH
6.5–7.5
Diet
Omnivore (pellets, veggies, insects)
Temperament
Semi-territorial
Grouping
Small groups with multiple hides
Experience Level
Beginner to Intermediate