Reduces the risk of bacterial and fungal outbreaks Provides great natural cover Provides biofilm grazing Stimulates breeding Relieves stress Mildly reduces pH It seems that most all the leaves we utilize in our aquariums provide some medicinal or antibacterial and antifungal properties. Leaves of the Katahal, which is also known as the Jackfruit tree, are no different and also have healing properties for human use. Originating from south India, Katahal is from the same family as the Mulberry tree and has many positive uses in the aquarium. For fish, they have great nutritional value in the leaves and in the surface growing biofilm.