http://www.aquariumplants.com/category_s/9.htmAny hybrid small (S) lily on that page should work. The warmer it is when you plant them the quicker they take hold. Mine established nicely but frikkin geese have eaten all the stems and pads; hopefully, the root structures are still there and they will pop back up later this year or next spring. To plant them barely cover the tuber with mud and place a small rock or brick on top to prevent it from washing away in a storm. I planted mine from 6" to 24" and the shallower ones took off quicker but eventually all of them had pads on the surface.
Tannins:
http://en.wikipedia.org/wiki/Tannin Several people have had incidents where the tannins in some trees that were to be used as fish structure harmed their water and caused a fish kill.
