Congo Wood is a natural wood prized in aquariums and terrariums for its exotic appearance and robustness. Native to Africa, it has knotty shapes and a unique texture, providing an ideal natural decor for aquariums, paludariums, and terrariums. It can release tannins, creating a "black water" effect beneficial to certain aquatic species. Pre-soaking is recommended to prevent it from floating and to limit the release of tannins.