Why do Xenia sp. pulse?

[Geraud]

I was actually wondering if this old question had been resolved.

Actually it has been and quite recently!

Here is the article:

http://www.advancedaquarist.com/blog/why-do-soft-corals-like-xenia-pulse




ps: I could not find the link on manhattanreefs.com. Mods feel free to remove if it had been linked before.