– Rich in Tannins with antibacterial and antifungal properties – Reduce the chance of bacterial infections -These tannins also facilitates molting of shrimps. – The shrimp either graze on the bio-film that will accumulate on the bark or eat the husk itself as it breaks down over a period of time. – Cover with boiling water and soak for 24 hours. Rinse before adding to your tank. – At first, rather start with a couple of pieces and then gradually add more.