I have a stalk of xania that appears to be shriviling. The trunk of the stalk is getting skinner and skinner. It is also a purplish color. Everything else is doing fine and my other xania don't show any change. Any ideas and should I move it to another tank and see how it does. It just starter doing it this week. Has been in this tank since december and had been growing well. I did frag a small portion about 3 weeks ago.