Plants take time to get used to new water conditions and usually look poorly for a time and even die back. Some recover and some don't.
Water wisteria is finicky about lighting. I kept it for a time and it did best in stronger lighting and floating rather than planted. When you plant it, the lower branches get too much shade and die, leaving you with a plant that's mostly stem.
I'd suggest floating it, so all the branches are exposed to the light. A much better choice is Anacharis or Brazilian waterweed. It's easier to grow and I think it looks just as nice. Attached are a couple of pics of some. It's the plant with the long leaves. The other, that looks like a lily pad is Pennywort, It's a nice floating stem plant too. Both are easy and will grow in moderate light.
"Fear not my child, just change the tank water."
Last edited by BBradbury; 05-01-2013 at 08:56 PM.