Catappa leaves, also known as Indian Almond Leaves, are widely used in aquariums to create natural, beneficial environments for bettas, shrimp, and other inhabitants. Here are the key benefits and features:

1. Natural Environment Replication: Adding Catappa leaves to your aquarium helps replicate the natural habitats of many aquatic species, especially those adapted to acidic waters and leaf litter.

2. Release of Tannins: When submerged, Catappa leaves release tannins and other organic compounds into the water. These tannins can lower the pH, creating a more acidic environment, while also imparting a gentle tint to the water, reminiscent of natural habitats.

3. Benefits for Aquatic Life: The tannins not only help to maintain stable water conditions but may also have antibacterial and antifungal properties, contributing to the overall health of the aquarium.

4. Food Source for Micro-Organisms: As the leaves decompose, they encourage the growth of beneficial microorganisms on their surface, which serve as a natural food source for shrimp, snails, and newly-hatched fish.

5. Aesthetic Appeal: In addition to the functional benefits, Catappa leaves serve as an attractive décor element, enhancing the natural look of the aquarium.

6. Usage: Typically, a few leaves can be added to the tank depending on its size. Over time, the leaves will break down and can be replaced regularly for optimal benefits.

If you have any further questions about using Catappa leaves or how they can benefit your aquarium, feel free to ask!