Banana leaves are mostly used to improve shrimp aquariums as they enrich the water with missing substances such as organic compounds and lower the pH of the water. They have many of the same properties as Catappa leaves for fish & shrimp which include fungicidal and bactericidal properties which aid the healing after infections. The leaves also release tannins and other elements into the water which improves the overall health of the fish and shrimp. Shrimp especially like to hide and spend time in around the leaves.