That plant is fine, I have had mine in the big tank for many many months..it is still healthy, I was told that I couldn't keep it there when I first bought my plants. It has outlived most of my "aquatic" plants.
Sky- blue SDT
St. Elmo's Fire- unknown colored CT
Sully-Light blue SDT
Henry- Orange rosetail HM
The girls: 1 combtail, 1 halfmoon, and 5 crowntails!