I have some xenia that snuck into my 175g on a powerhead, It's about 8" below a 250w mh light, lots of flow and its growing and pulsing like crazy. I don't think anyone really knows why they pulse or what causes them to stop but I suspect they love a high nutrient tank :mrgreen:

im 95% sure that is not xenia listed on your site. i have the same stuff and was sold as xenia, its accutally called Anthelia or something like that.

I think they are just diffrent types of xenia. I have 2 types, one is more purplish color and does not pulse, it is a pompom xenia. The other is a waving pulsing xenia and it is more pink and sways out extending much longer. It looks liek a mix between the pom pom and the anthelia kind of.
My Anthelia is also long and wavy as well.

Anthelia key to id, always arise directly from the basal encrusting mat.
Xenia typically has a stalk and branches

I wonder if it may actually be the SPS affecting the xenia rather than the tank conditions. When I set up my new tank and moved everything into it my xenia were subjected to much higher flowrates and mh lights rather than pc's. They have flourished (in fact I'm going to have to frag some out soon, it's really getting crowded) and are pulsing. I have xenia right from the bottom of the tank all the way to the top, within about 10" of the lights, and in areas where the current varies from quite low to being directly in front of powerheads. Directly in front of the powerheads it seems to grow a bit slower, but it does grow and still pulses.

The tank environment....lighting, flow, etc will greatly affect the way xenia looks and grows. Same goes for pretty well any coral for that matter.

xenia grows in tall stalks that looks more like a tree, anthelia always grows like a mat and will never really have 2 polyps come out of one stalk.