Nature4Pets Catappa Bark Tubes 1pcs 3-6cmx12-20cm

Catappa Bark Tube is a natural tube made from the bark of the Catappa tree (also known as Sea Almond / Indian Almond / Terminalia catappa).
The Catappa Bark Tube offers multiple benefits to the aquarium:
Releases tannins (which are natural plant substances that slightly darken the water) — this helps lower the pH and create more natural “blackwater” conditions.
Has antimicrobial / preventive properties. Tannins and other substances in Catappa are associated with reducing pathogens and improving the health of the skin and gills of fish.
Acts as a shelter / hiding place for shrimp, bottom fish, small fish and others that need protection from light or stress.
The thickness of the tube means that the release of the active substances is slower and more consistent, the action lasts for about 4 months.  ...More