I do not think your Xenia is the same type as Whitesharks, It looks like silver elongota to me. This might be a reason why it is acting strange. However, it should not be shriveling up. You may need to move it to an area with a little more flow and more lighting, this might help it. Also check you SG, Xenia seem to like about 1.025. Another thing you should consider is where the Xenia came from. Alot of people have trouble keeping Xenia when it is first, second and even third generation. If you can find someone who has an old strain that has been through numerous tanks your chances of successfully keeping it a doubled.