With the current in my tank, it's hard to tell.  Even my blastos inflate like crazy and look like they are pulsing as the MP-40's go through their random program.   This is a very interesting and unusual coral.  I originally mounted it mid point in the tank but found it developed a temporary case of E.D.  :~ and retracted .  I moved it to the bottom and it re-inflated  :* and reopened right away.  It can be very limp but not as much as a deflated as a xenia. Quite an interesting transformation to observe.  Despite it's somewhat bland color, it's a very welcome addition to my little world.  It's showing all the signs of pushing out new growth so I'll be should be able to put a couple DBTC frags back into the system in just a  few months.