İ have an awesome blue/green one (killer color), it will not open to save my life. İ know its alive.. İt acts like its going to flower up, i wait, i wait and... Nothing!!
Also have a yellow one, doing
I just got a frag and I noticed mine only tolerates low flow. It won't open otherwise. Let me see if I can find you a very informative article on these guys that I read.
Edit: Here you go!
http://www.reefkeeping.com/issues/2005-10/nftt/index.php
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