Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
For nutrients you could put some fertilizer tablets in the pot. Put them toward the side of the pot so the roots have to grow toward them. There are pond tablets, or you can use aquarium tablets, or even Osmocote in a gel-cap, just like for aquarium use.
Odd that the leaves gave up, but good that you see more. Did some change happen, such as temperature, or suddenly more sun?