Indian almond leaves, or Cattappa leaves, come from a tree primarily found in Asia, Africa, and Australia. The tree itself is referred to by several names, the most common of which is the Indian Almond Tree. While the name may suggest that this tree grows almonds, or a similar nut, the tree actually produces fruit. The name comes from the fact that many states that the fruit tastes like almonds, especially somewhat bitter ones. The fruit, just like the leaves, is somewhat acidic. This acid is beneficial in your aquariums if you know what you’re doing. These leaves tend to be brown or dark orange in color and are somewhat tear-drop-shaped. They will range from two to fourteen inches in length when you buy them. The size of the leaf doesn’t matter, but a small leaf will have more of an effect on a small tank than a large tank.