Oak Leaves for Fin Rot?

[OrangeAugust]

Shiny has fin rot. His fins looked a little weird on the edges but I thought they were starting to curl like Fishie's did because of the hard water. But then today I came home (I hadn't been home since yesterday morning) and his dorsal fin is red on the edges and has a hole in it.
Of course I did a 100% water change and added Stress Coat and AQ Salt to the water, but I had also collected dried oak leaves from my parents yard today. Oak leaves help with fin rot, right? The same as IAL? So I tore off a piece of an oak leaf and put it in the water (rinsed it off first), but am I just supposed to let it float in the water or was I supposed to sort of crush it up and make a tea out of it? What's the best way to get the tannins in the water from the oak leaf?
Thanks!

[914joe]

I think you use them same as IAL leaves just put in the tank or bowl no need to crush it,after a day or 2 it will fall to the bottom of the tank ,make sure they are not sprayed with pesticides ,where i am they spray for west nile so i don't want to take a chance i use IAL .

[cjz96]

A tannin source never hurts. Oak leaves are very beneficial and anti bacterial. It toughens scales and wards of any other infections your betta may get while undergoing treatments. Premix a jug of conditioned water and put 10-20 dried oak leaves in. Steep till it's a weak tea color. The longer it steeps, the darker it gets.