Vampire Crab Care Guide - Paludarium Setup, Diet & Breeding

Vampire Crabs are small, striking semi-terrestrial crabs named for their vivid yellow eyes and deep purple, burgundy or near-black bodies. Their contrasting colours make them popular inhabitants of planted paludariums, where they can be observed climbing, exploring and emerging from cover.

Vampire Crabs in the aquarium trade are Geosesarma species from Southeast Asia, especially Indonesia, including Java and nearby islands. The exact origin varies between species and commercially traded forms, many of which have historically been sold under the general name Geosesarma spp.

A group of Vampire Crabs should have at least a 60-litre paludarium, ideally around 60 × 30 cm of floor space or larger, with a land area making up most of the usable layout and a shallow freshwater pool for drinking, soaking and moulting. Use a tightly secured lid, humid air, gentle ventilation and numerous caves, cork pieces, roots, leaf litter and live plants. The land section should be escape-proof and made from stable, well-drained materials rather than deep open water; a soft, natural substrate such as sand or fine gravel is suitable around the pool, with leaf litter and moss providing additional cover.

Adults usually reach about 2.5 cm (1 inch) in carapace width. Including the legs, the overall span is commonly around 5–6 cm (2–2.4 inches). Males may become slightly larger and more robust than females, although size varies among Geosesarma species.

These opportunistic omnivores eat a varied diet of sinking crab and shrimp foods, algae wafers, blanched vegetables, leaf litter and small portions of frozen or dried animal foods such as bloodworm. They also graze on biofilm and consume detritus. Offer modest portions and remove uneaten food promptly, especially in the warm, humid conditions of a paludarium.

Vampire Crabs are best kept in a species-focused paludarium with other peaceful members of the same species, provided there is enough space and shelter. They are not ideal companions for fish, as they may catch small or slow-moving species and fish can stress or injure them. Shrimp, snails and other small invertebrates may also be hunted, while larger aquatic animals can prey on the crabs. Avoid mixing them with aggressive crabs or species with very different humidity and land requirements.

Vampire Crabs are most likely to breed in a mature paludarium with stable warmth, high humidity and plenty of hiding places. The female carries a relatively small number of large eggs beneath her abdomen, which hatch directly into tiny, fully formed crabs rather than free-swimming larvae. Provide dense cover and separate young from predators, as adults may eat newly independent juveniles. A secure land area is essential because the young spend their early lives out of the water.

Males are often slightly larger, with a narrower, more pointed abdominal flap and larger claws. Females generally have a broader, rounded abdominal flap adapted for carrying eggs, and their underside may appear fuller when they are berried.