yep, I got about 3.5 kitchen garbage bags full still.
I add them to the top of the water and let nature takes it course and put the leaf litter where it "belongs"
I use about 5 leaves per 10g then go from there.
I also make my own BW extract using oak leaves. also a few chunks of oak in the boil mix helps it out a bit to with the color. Im not a scientist and dont know the invisible benefits of it but whenever my angels get fresh extract the eggs seem to flow freely.