What is coming out of my clam?

I've had this guy for a couple weeks now. Don't mind the poor mantle extension, it's normally better than this. Right after feeding the tank mysis cubes today this white thing kept poking out of the clam. I thought the foot came out the bottom, and this is coming out of the inlet. What is it?
 

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Yeah that looks like the exhalent siphon to me. Pretty blurry picture though. The foot should be on the bottom not there.
 
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