Weird white thing on rock

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Jé123

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Hi I was just wondering what was this white bubble with a hole in the center? Is it good or bad? Should I get rid of it?
 
I want to say ball sponge but with opening that represents a mouth, may be tunicate. Does the opening stay stationery or does it pulse occasionally. If stationary- sponge. if it moves - tunicate.
Either are reef safe
 

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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