You can just use it as oak leaves or alder props.
It's also very suitable to use on you're tank floor as leaflitter.

In aquarium it's used for a long time for it's healing, anti-fungal and anti parasite properties for example.

Some tribes still use the different parts of these trees as a homeopathic medicine to cure all kind of things,
there are different scientific researches done to the properties that approve these abbilities.
For example it's used to get rid of intestinal parasites in human, against traveling nausea, to stop bleeding, against burns, eye problems and even against certain types of cancer.

Here are some links you may like to read about it, or just google if you like to find more about the indian almond leaves


~ Indian Almond Leaves (T. catappa) for Aquariums ~

http://www.ajol.info/index.php/bajop...le/58449/46794

Acta Horticulturae

Terminalia catappa health benefits

Terminalia catappa Linn. (Combretaceae)

Antiparasitic, antibacterial, and antifungal activities derived from a Terminalia catappa solution against some tilapia (Oreochromis niloticus) pathogens | Mendeley

New Cures » cancer cured with terminalia catappa plant products

Antimetastatic effects of Terminalia catappa L. on oral cancer via a down-regulation of metastasis-associated proteases 10.1016/j.fct.2010.01.019 : Food and Chemical Toxicology | ScienceDirect.com

Terminalia catappa Linn. (Combretaceae)