The Sea Almond

The leaves of the Sea Almond tree have become popular with aquarium owners as a natural water-improver that has protective health benefits for many types of delicate fish species.

Also known as the Indian Almond, these trees grow in Southeast Asia, India, northern Australia, and New Guinea. Although it prefers a sandy seaside environment, it grows well inland, and can reach a height of 35 mmetres.

The large leaves range in colour from a tropical green to orange and deep red, and the tree itself has a pleasingly ornamental tiered form. For this reason is sometimes called the Umbrella Tree.

The leaves grow to about 15 - 35cm in length, with a corresponding width of about 10 - 17cm. They naturally produce chemicals to protect against attack by parasites and insects, and are rich in flavonoids, tannins, saponines and phytosterols.

(Latin name: Terminalia catappa)

How Sea Almond Leaves Are Used

Either fresh or dried, one leaf per 3-foot aquarium is sufficient for about a fortnight, so long as it does not begin to disintegrate or decompose. A leaf which begins spoiling should be removed at once.

The organic acids and tannins released by the leaves into water help reduce bacterial activity and are generally suitable for use even with delicate fish species.

They are apparently best suited to tropical fish like bettas and discus, and are popular with betta breeders in Thailand.

Reputedly, the leaves can also help encourage breeding.

Note that in addition to helping balance water PH, the tannins and other organic acids released can also cause the water colour to darken.