Kip, that's a beautiful stand of xenia.
I've personally had mixed results with Xenia. It will do well for months at a time then slowly fade. And the xenia I've had in the past were frags from established, local tanks.
I'm workingt a theory on xenia. It may be incorrect , but until someone can convince me otherwise, I'll go with it.
Xenia often do well in water that is less than pristine. I have no idea why, and I'm no scientist, but for some reason, water with traces of nitrates often lead to healthy stands of xenia.
Water that is "too clean" seems to cause xenia not to spread rapidly.
I've got no evidence to back this up, and I could be way off base. I'd love to get more knowledge on the subject.
Spinner