I just got me another piece of live rock for my marine aquarium. This one ha
this calcified looking long tubes on it with these worm looking creatures in
them. When the creatures come out they have these two pine tree looking
antenna that pop up. They're very sensitive to fish swimming by and will yank
themselves back into their holes.
What are these (though I've certainly seen them before)? Do they require any
special care?
Take care,
          John
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