Who Gives A Fish Forums

Thanks for the suggestions, everyone. I'll try oak leaves first since they're easy to find. Appreciate the help!

I've been using Indian almond leaves for my betta tank, but they're getting pricey. Anyone know good alternatives that won't break the bank? My tank's a 10-gallon with sand substrate, and I do weekly 20% water changes. The betta's healthy, but I wanna keep the tannins steady.