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Vampire Crab
Geosesarma dennerle
📍 Indonesia (Sulawesi)
The Vampire Crab is a striking semi-aquatic crab native to Indonesia, known for its deep red coloration and bright yellow eyes. These small, peaceful crabs are primarily terrestrial but require access to water for respiration and moisture. They are popular in paludarium and semi-aquatic setups due to their unique appearance and relatively manageable care requirements.
Care Guide
Diet
Vampire Crabs are detritivores that feed primarily on biofilm, algae wafers, and decaying organic matter. Supplement with blanched vegetables (spinach, zucchini) and high-protein foods like small pieces of fish or shrimp pellets 2-3 times weekly. A mature tank with established biofilm is essential for their nutrition.
Behavior
Vampire Crabs are primarily nocturnal and spend much of their time on land or in shallow water, using their gills to extract oxygen from moist air. They are solitary and territorial but generally peaceful toward other species. They are excellent climbers and will attempt to escape if not provided with a secure lid; they require both aquatic and terrestrial zones in their habitat.
Breeding
Breeding in captivity is extremely difficult and rarely successful in home aquariums. Females produce larvae that require brackish water to develop, making freshwater breeding nearly impossible. Most Vampire Crabs in the hobby are wild-caught, and breeding is not recommended for hobbyists.
Tank Mates
Both are peaceful detritivores that occupy similar ecological niches without competing aggressively
Peaceful invertebrates; Vampire Crabs may occasionally harass shrimp but rarely cause serious harm
Small shrimp may be preyed upon by crabs; only suitable in larger tanks with ample hiding spaces
Provides biofilm growth, shelter, and climbing surfaces that crabs require
Hardy plant that provides cover and biofilm without being damaged by crab activity
Common Diseases
Shell Erosion / Molting Issues
Soft shell, difficulty molting, shell pitting or discoloration, lethargy during molt cycle
Ensure adequate calcium and minerals in water; provide cuttlebone or mineral supplements; maintain stable water parameters and humidity; reduce stress by providing ample hiding spots
Fungal / Bacterial Infection
White fuzzy growth on shell or legs, discolored patches, lethargy, loss of appetite
Perform frequent water changes; improve water quality and aeration; isolate affected crab if possible; maintain optimal temperature and humidity; consider antifungal treatments if severe
Parasitic Infection (Mites, Flukes)
Excessive grooming, visible parasites on shell or legs, lethargy, difficulty molting
Quarantine affected crab; perform water changes; improve tank hygiene; may require targeted parasite treatment; ensure proper humidity and water conditions to support immune function
Desiccation / Dehydration
Dry shell, lethargy, inability to move properly, death if severe
Maintain high humidity (80-90%); ensure constant access to water; provide misting or humid substrate; check that terrestrial areas remain moist but not waterlogged
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Quick Facts
- diet
- Omnivore - detritivore; feeds on biofilm, algae, decaying plant matter, and small invertebrates
- lifespan
- 2-3 years
- max size
- 2 cm (0.75 in)
- tank size
- 5 gallons minimum
- temperament
- peaceful
Water it likes
- ph
- 6.5-7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 4-8 dGH
- temperature
- 72–79°F (22–26°C)