The roots were underwater for one day. They were a bit off white and some brown stuff collected around the roots where they came out of the net pot. Washed the brown off with water and used 5% H2O2. One teaspoon per gallon. Twenty four hours later they look okay.
The stem seems a little thin. After a few days of recovery I'll cut the roots just above the water line in an attempt to make the stem thicker.