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Dry Almond Leaves Terminalia Catappa

Indian almond leaves come from the Terminalia catappa tree. The leaf of this tree is especially known for its ability to act as a natural medicine and aquarium water conditioner for betta fish and shrimp tanks when the leaf has emerged in water for extended periods of time. Indian almond leaves are said to help combat fungus and bacterial problems like fin rot and can further help prevent fish from getting stressed by mimicking the water they are naturally found in. The Terminalia catappa tree grows throughout the tropical regions of Asia, Australia, and Africa. As we’ll discuss later, the leaves fall from the tree and into the water. Tannins then leach out of the leaves into the water, adding hues of yellow and brown while lowering the pH.

What do Indian almond leaves do for your water and for your fish?

When placed in water, Indian almond leaves slowly start to decompose. While this happens, the leaves turn the water a yellow or brown colour by releasing tannins. These tannins gradually lower the pH of the water and are said to have antifungal and antibacterial properties, which comes in handy when you have a fish suffering from fin rot or when you’re raising vulnerable fry.

This ‘healing’ ability is actually a direct effect of what tannins are meant to do; in trees and plants, tannins are mainly stored in the bark and new leaves. The tannins have the ability to precipitate out important enzymes from bacteria and fungus, preventing the tree or plant from becoming infected. This would then likely bolster the ability of the fish to fight off infections as well when Indian almond leaves fall into the water and the tannins leach out. The dark water tank appearance caused by these tannins is considered unsightly by some aquarists, but it actually mimics the natural habitat of many fish species! In fact, it’s said that a lot of fish feel less exposed when in dark water, which may help shyer fish gain more confidence that will bring them to the front of the tank. These properties alone definitely make using Indian almond leaves worth considering, but we’ll discuss even more benefits to adding some leaf litter to your tank later!

Many people use Indian almond leaves in their betta fish or shrimp tank, but these leaves can be used in many situations for other fish as well:

Adding an Indian almond leaf or two to a quarantine tank with a sick fish can help speed up the healing process. I’ve spoken with betta fish breeders who have actually stopped using regular fish medications altogether. They have started treating sick fish with nothing but Indian almond leaves, clean tank water, and activated carbon.
When you’re dealing with fish or invertebrates that prefer water that is soft and acidic, Indian almond leaves can be great for stimulating breeding. The tannins released by the leaves help create water conditions that are similar to those in the natural habitat of the fish, which further help replicate breeding conditions. If you’re trying to get your betta fish or crystal red shrimp to breed, adding an Indian almond leaf or two to the breeding tank may help speed up the process!
Indian almond leaves are also used as a beginning food source for certain fry and baby shrimp because they like to feed off the decomposing leaf matter. Not only does the Indian almond leaves potentially provide a first meal for the fish or shrimp, but they can also be used as emergency food if other food sources are scarce. Indian almond leaves also allow smaller fish to hide amongst the leaf litter where other larger fish can’t easily see and eat them.
Indian almond leaves are also used to condition aquarium water and maintain water quality. In fact, this method is sometimes known as the “poor man’s water conditioner”; however, the wrongly-named “poor man” is most likely describing those (lucky!) aquarium keepers that have readily available access to Indian almond leaves. For the rest of us, getting Indian almond leaves can be quite expensive, so it’s typically best to buy them in bulk when possible (and you should still always use commercial aquarium water conditioner just to be safe)! Since Indian almond leaves also help slowly lower the water pH, it’s said to be better for keeping harmful ammonia levels under control since ammonia is converted to the less toxic ammonium at low pH (anything less than 8.0).
Lastly, it is very common for fish enthusiasts to use Indian almond leaves in their tank just to stain the water with the tannins. If you’re interested in setting up an Asian blackwater biotope, which imitates blackwater rivers and streams, natural foliage like Indian almond leaves or other leaf litter is a must-have. These leaves appear in these regions naturally so they are biotope-correct and will be willingly accepted by your fish and other tank inhabitants. You can also add Indian almond leaves to other tank setups with fish that prefer soft and acidic water if you just like the look of it. Never add Indian almond leaves to a tank that has fish or other invertebrates that require higher water pH levels!