I'd say its a good idea. Indian Almond Leaves have alot of antibacterial properties which minimize the chances of bacterial infections, improve health, stimulate the natural environment of fish who hail from soft, acidic waters, stimulate breeding conditions and harden scales which does minimize skin diseases and pathogens resulting in bacterial infections that dwell on the epidermis of the fish. Also Stimulates Color, Prevents Parasites, Relieves stress and helps your fish recover from illnesses..
Only bad part is if you don't like the look of yellowish/brown water. But will make your betta fish happier and healthier!