Geosesarma hagen is a striking species of semi-terrestrial crab native to Java, Indonesia, widely known in the aquarium trade as the Red Devil Crab due to its vibrant red carapace and contrasting yellow eyes. This species inhabits humid environments near tropical forest streams, requiring a specialized paludarium setup that offers both damp land areas for burrowing and clean freshwater access for hydration and molting. Maintaining high humidity, stable tropical temperatures, and providing a diverse diet rich in calcium and protein are essential factors for ensuring their long-term health and successful reproduction within a captive ecosystem.
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