Not sure whether vampire crabs go in an aquarium or a terrarium? They need something in between: a lidded paludarium that’s mostly land, kept humid by a closed lid, moss and misting, with a water section every crab can climb into and fully enter. Vampire crabs are small semi-terrestrial crabs that live on land and use water, and they usually go into the water to molt. Keep a group, and hold the enclosure at about 78°F (26°C), within 72-85°F (22-29°C).
The crabs sold as vampire crabs belong to Geosesarma, a large genus of semi-terrestrial and land-living crabs from freshwater habitats in Southeast Asia and nearby islands.1 By 2026 it had 73 described species,2 found from Southeast and East Asia to the Solomon Islands.3 They’re sesarmid crabs, a family whose semi-terrestrial members breathe air by holding water in their gill chambers and recirculating it.4 That’s why a vampire crab needs land to live on and water it can get into. Can it live in a regular aquarium? No. They aren’t aquarium animals, and a flooded tank is the wrong home for them. Our guide to whether vampire crabs can live in water explains why.
Most of the work comes down to three things: humid air, a tight lid and a water section that’s easy to reach. Get those right and the rest of this page is fine tuning.
| Enclosure | Lidded paludarium, mostly land, with a water section every crab can climb into and fully enter |
|---|---|
| Temperature | About 78°F (26°C), within 72-85°F (22-29°C) |
| Humidity | High all the time: closed lid, moist substrate and moss, regular misting |
| Molting | Usually in the water, so the water section is part of their care from day one |
| Food | Small live, frozen or dried animal food plus vegetables or a little fruit, in small portions |
| Tank mates | Neocaridina shrimp first; small, peaceful fish only |
| Breeding | Fresh water is enough; up to about 40 crablets a clutch, moved out because adults eat them |
| Adult size | About 10-15 mm across the shell, roughly half an inch |
| Lifespan | About two years at most |
How do you set up a vampire crab paludarium?
Build a paludarium that’s mostly land, with a water section a crab can climb into, fully enter and climb out of. Give every crab somewhere to hide, and fit a lid that closes tight. Some keepers call it a crabitat, which is hard to argue with. A vampire crab tank setup starts with that land-to-water split, then the lid, humidity and heat. The land section is where your crabs spend their days, so it gets the moss, the cover and plenty of hides. The lid does two jobs at once: it keeps the crabs in and the moist air in. For that moss and cover, start with the best plants for a vampire crab paludarium.
What climate do vampire crabs need in their enclosure?
Keep the enclosure at about 78°F (26°C), within 72-85°F (22-29°C), and keep the air humid all the time. Warmth is the easier half. A small aquarium heater in the water section is one way to hold it. Whatever you use, put a thermometer at crab level as well as in the water, because the crabs live up on the land.
Humidity is the harder half. Dry air is the common failure, and you fix it with a closed lid, moist substrate and moss, and regular misting. One keeper reports running at 75 percent humidity or higher. Another misted every day while the plants were settling in, and now mists only every few days. You can judge it by eye: if you see the moss drying out between mistings, mist more often or close more of the gaps in the lid. Watching the moss is an easy way to keep a vampire crab tank humid between mistings.
What do vampire crabs eat?
At home, what vampire crabs eat can be small live or frozen animal food, such as fruit flies or bloodworms, plus a little plant matter. Land crustaceans in general mostly eat detritus and plants and add animal food, and many small species eat both.5 In the wild, two vampire crab species described from central Java feed at least partly on insects, and one of them probably also on midge larvae and plant detritus.6 Keep portions small and varied. Lift whatever isn’t eaten within a day, before it goes moldy in the humid air.
Wondering why the food sits there untouched while you watch? Vampire crabs mostly eat at night, so are vampire crabs nocturnal explains when to feed and when to look for them. If a crab seems to skip its meals, vampire crab not eating covers what to check.
Why vampire crabs must be able to get fully into the water to molt
Vampire crabs usually molt in the water, so every crab needs to be able to reach the water section, get fully into it and leave again. In our paludariums, the crabs spend their time on land and climb down into the water from time to time to feed and to molt, so the water section has to be one a crab can climb into and fully enter. To tell a shed from a dead crab, and to know what to do while a crab molts, read our guide to vampire crab molting.
Give the water section a gentle slope or a rough surface so a crab can walk in and back out, and keep the water clean. If you find a crab that’s just molted, leave it alone and don’t try to lift it out.
Can vampire crabs live with shrimp, small fish or their own young?
Hardy shrimp and small, peaceful fish can share the water section, but crablets can’t stay with the adults. Adult vampire crabs eat crablets they find, so crablets are moved out to grow up. Dwarf shrimp such as Neocaridina are the easier pick when vampire crabs live with shrimp.
Neocaridina shrimp are the easy first choice. They grow and breed at 82°F (28°C) in published data,7 which sits inside the crabs’ 72-85°F (22-29°C). Small, peaceful fish and small snails can share the water too. Bee and Crystal Caridina are the awkward fit, because they meet the crab range only at 72°F (22°C). Our ranked list of vampire crab tank mates goes through each one.
Weighing up a red claw crab instead? Read vampire crab vs red claw crab first. Red claw young need salty water, and the two crabs don’t belong in one tank.
How do vampire crabs breed without brackish water?
The vampire crabs sold in the hobby breed in fresh water: large eggs hatch straight into tiny crabs, with no larval stage, so you never need brackish or salt water. Over 90 percent of the Geosesarma species whose egg size had been recorded by 2019 have large eggs and develop this way.1 It isn’t true of the whole genus, though. A few have small eggs and swimming larvae instead, including two species found in Taiwan.1
One clutch can give up to about 40 crablets. Successful vampire crab breeding at home depends on one step. Since the adults eat the young they find, move the crablets to their own container to grow up, and keep that container as humid as the main enclosure. One keeper who raised broods both ways got only a few crablets to adult size when they grew up with the adults, and many more once they were separated into boxes.
Plan for a small vampire crab with a short life
Vampire crabs are small and short-lived: about half an inch across the shell, and about two years at most. Both figures shape the tank you build and how long one group lasts.
How big do vampire crabs get?
Adult vampire crabs measure about 10-15 mm across the shell, roughly half an inch, in the species that have been described. Type specimens of G. dennerle, G. hagen and G. pontianak measure 14.4, 13.9 and 13.4 mm,68 and two Java species described in 2024 measure 12.8 and 12.3 mm.9 You’ll often read that vampire crabs reach about 2 inches (5 cm). That figure could only describe the legs, and no leg span has been measured, so don’t size a tank or a water section around it.
How long do vampire crabs live?
Vampire crabs are short-lived, about two years at most. A 2019 compilation of longevity in crabs, shrimp and lobsters lists about two years as the longest recorded life for three described vampire crab species. That figure comes from keepers’ species profiles, not from crabs aged in a study.10 If you want vampire crabs for years, plan for a colony that replaces itself by breeding, and treat the crablets as the future of your group.
Why do vampire crabs die one after another?
When crabs start dying one after another, check the lid first, then humidity, temperature, water access and finally crowding. Work down the list in that order, because the first checks are the quickest to make and the easiest to put right. The same checks lead the list of common vampire crab mistakes, which puts the setup errors that cost crabs their lives first.
- Lid: every gap is closed, including where tubing, cords or a heater cable pass through.
- Humidity: the moss and substrate stay moist between mistings, and the air doesn’t dry out when the lights are on.
- Temperature: a thermometer at crab level reads within 72-85°F (22-29°C), day and night.
- Water access: every crab can reach the water, get fully in and climb back out.
- Crowding: every crab can get out of sight at once, and none is chased out of cover again and again. That’s also the test for how many vampire crabs can live together.
If one crab is still, foaming at the mouth or missing legs, work through why vampire crabs die sign by sign.
Still losing crabs after all five checks pass? Email contact@shrimpaquatics.com with your temperature, how you keep the air humid, a photo of the setup and what you’ve seen. We’ll help you work through it.
Ordering tank-bred vampire crabs from Shrimp Aquatics
Our vampire crabs are tank-bred lines, such as the Tomato Vampire Crab, Geosesarma sp. “Tomato”, and the White-handed Vampire Crab, a Geosesarma species. Everything in our catalog is bred or propagated in our own tanks rather than collected from the wild. That matters here, because several Geosesarma species are collected in large numbers for the aquarium trade.9 Where those wild crabs come from, and why none has an IUCN assessment, is covered in where vampire crabs come from. You choose male or female on each product page, so you can set up the sex mix you want, and checking male vs female vampire crabs by the flap underneath tells you what you already have. We can’t promise that a group will breed or how many young you’ll get.
Confirming your own import rules is part of ordering. We cannot tell you that live freshwater invertebrates are legal to import where you live.
Have the paludarium humid and running before the box arrives. If your crabs arrive weak, follow the instructions supplied with your order. Our live arrival guarantee works like this. Livestock that arrives dead is replaced free of charge, counted from the first animal, when you report it within 2 hours of the carrier’s delivery time with an uncut unboxing video.
References
10 Sources
- Shy and Ng, Geosesarma mirum, a new species of semi-terrestrial sesarmid crab (Crustacea, Decapoda, Brachyura) from central Taiwan, ZooKeys 858, 2019.
- Grinang, Ng and Ng, A new species of vampire crab of the genus Geosesarma De Man, 1892 (Crustacea: Brachyura: Sesarmidae) from a montane forest in southwestern Sarawak, Malaysian Borneo, Raffles Bulletin of Zoology 74: 457-464, 2026.
- Ng, Geosesarma sodalis, a new species of vampire crab (Crustacea, Brachyura, Sesarmidae) from a limestone cave in central Sarawak, Malaysia, ZooKeys 1031, 2021.
- Species-specific gill’s microbiome of eight crab species with different breathing adaptations, Scientific Reports 13, 2023.
- Marin and Tiunov, Terrestrial crustaceans (Arthropoda, Crustacea): taxonomic diversity, terrestrial adaptations, and ecological functions, ZooKeys 1169: 95-162, 2023.
- Ng, Schubart and Lukhaup, New species of “vampire crabs” (Geosesarma De Man, 1892) from central Java, Indonesia, and the identity of Sesarma (Geosesarma) nodulifera De Man, 1892 (Zenodo archive copy of the paper), Raffles Bulletin of Zoology 63: 3-13, 2015.
- Tropea, Stumpf and Lopez Greco, Effect of Temperature on Biochemical Composition, Growth and Reproduction of the Ornamental Red Cherry Shrimp Neocaridina heteropoda heteropoda (Decapoda, Caridea), PLOS ONE 10(3): e0119468, 2015.
- Ng, Semiterrestrial crabs of the genus Geosesarma De Man, 1892 from western Borneo, Indonesia, with descriptions of three new species (Geosesarma pontianak treatment, Plazi TreatmentBank copy of the paper), Zootaxa 4048, 2015.
- Ng and Wowor, Two new species of vampire crabs (Crustacea: Decapoda: Brachyura: Sesarmidae: Geosesarma De Man, 1892) from Java, Indonesia, Raffles Bulletin of Zoology 72, 2024.
- Vogt, A compilation of longevity data in decapod crustaceans, Nauplius 27, 2019.
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