Live Rock criter trick

Frankthetank

Franco
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Hi all

Have an interesting thing happening in my tank. I got some live rock a few years back. In one of these LR’s there are a few small openings almost like tubes. I suspect that within this particular LR there is a network of small tube/caves.

In the past I always noticed substrate after a few hours on top of the LR and sometimes could see it move thus obviously something is living in there.

I had/have a bristle worm or 2 in my tank, could this be one of these guys?

The interesting thing is when I moved to my new place, after setting up the water was a bit milky. It looked as if the LR was blowing “smoke” out of one of these openings every 20 seconds or so about 10cm High? I don’t believe a bristle worm can do that. Since then haven’t seen “smoke” again.
 
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very much doubt bristle worms thats for sure. the substrate moving seems to be a largish creatchure though. Perhaps mike has some ideas.#


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