ID please

Not quite sure what this is... I have a pretty nice size Zoa colony I picked up at my LFS. I noticed that in the early morning hours just before lights go on there are two large red tubes coming out of the colony. Thought it could be a sponge but it retracts. Possibly a clam of some sort, but the colony doesn't move. Just the two siphon tubes come up and down depending on the time of day, and always during coral feeding Sunday's.
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doesn't seem to bother the Zoa's and its cool having a lot of life in the tank. Just would love to know what it is.
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Not vermetid Snails, I've had those before, much smaller tube. These tubes are about 1/4 inch OD. and retract back. No spiderweb castings either. Just sucks in water during feeding. I looked at multiple barnacle images, no feather duster that comes out.
 
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