Indian Almond Seedling.Indian almond leaves (IAL) have traditionally been used by South East Asian Betta breeders to mimic the natural Betta habitat in captivity and make their fish stronger, healthier and more reproductive. Indian almond leaves are also believed to help fighting fish get in prime shape before a battle and heal their wounds afterwards.
As far as I know, the effect of Indian almond leaves on Betta fish has not been scientifically studied and it can therefore be hard to separate truth from myth when discussing IAL and Bettas. I can only speak from personal experience with Indian almond leaves in Betta tanks and relay anecdotal evidence from fellow Betta keepers. Hopefully, the field will be more thoroughly investigated in the future.
Using Indian almond leaves in Betta tanks
If you use Indian almond leaves all the time, the safest course of action is to gradually wean your Betta off the stuff before selling it to an aquarist that won’t use IAL. A Betta raised in an IAL-tank (or even one that has spent a lot of time in such a tank) can have a hard time adjusting if suddenly tossed into a tank without Indian almond leaves. Make the process slow and gradual.