Planted Tank Guru
Join Date: Feb 2010
Location: Newbury Park, CA
Try sticking a root tab under the plant. Maybe it will grow roots better.
I have the same problem, the plant prunes itself. Weak stems, not enough roots and lots of buoyant leaves. I pull the leaves on the fragment under the substrate to help anchor which works until the leaves rot away. Since the plant hasn't grown many real anchoring roots it comes right up again.