ID please

I can not make heads or tails of the unknown, try a shot with less blue and more white/day lighting. Are you certain the unknown is a LPS?
 
Looks like a sponge but with a dead/floppy side?
 
Maybe a sponge? Is the flow in your tank making it move?
 
Was just going to say that it looks like the excurrent siphon (not sure if that's the correct terminology) of a larger tunicate - most of which would be underneath that rock.

~Bruce
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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