I know im commin in realy late, but the last pics make me think it is anthilia. I have some blue anthilia in my tank that looks just like they closed up head at night. The xenia closed up into a ball, and the anthilia closes up into a point. The stalks look very simular too. My anthilia will also pull in one "finger" at a time. This is a really cool thread!!!!! Lets just call it a xenia anthilia hybrid that encrusts, lol. Be carefull with this stuff, if it grows like xenia, the encrusting will make it really hard to get rid of!!
Michael
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