white tublar new residents from behind the rock

We discovered these guys living behind our rock when we moved the rock and exposed them. they look like they are several inches long, very white, and have a clear opening at the top. i can't find the base - it must be back and low behind the rocks. what are they and are they okay?
http://i984.photobucket.com/albums/ae330/BonzerB2009/a4cd9832.jpg

 

Not sure what I'm supposed to be looking at.

 

I believe they are sponges, mine sometimes grow like that, but really need a better image.

Welcome to 3reef, BTW.

 

another attempt (although sad i know) at the picture - i think in one pisture you can see the hole at the top of one of them.
<a href="http://s984.photobucket.com/albums/ae330/BonzerB2009/?action=view&amp;current=a4cd9832.jpg" target="_blank"><img src="http://i984.photobucket.com/albums/ae330/BonzerB2009/a4cd9832.jpg" border="0" alt="Photobucket"></a>
<a href="http://s984.photobucket.com/albums/ae330/BonzerB2009/?action=view&amp;current=80478c85.jpg" target="_blank"><img src="http://i984.photobucket.com/albums/ae330/BonzerB2009/80478c85.jpg" border="0" alt="Photobucket"></a>
<a href="http://s984.photobucket.com/albums/ae330/BonzerB2009/?action=view&amp;current=5e064303.jpg" target="_blank"><img src="http://i984.photobucket.com/albums/ae330/BonzerB2009/5e064303.jpg" border="0" alt="Photobucket"></a>
http://i984.photobucket.com/albums/ae330/BonzerB2009/5e064303.jpg
http://i984.photobucket.com/albums/ae330/BonzerB2009/7b985eaf.jpg
http://i984.photobucket.com/albums/ae330/BonzerB2009/80478c85.jpg

 

If you found them in the back shaded area chances are they're sponges.

 

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