Hello all...my clam has been looking a bit off the past 2 days. He's been keeping the lower part of his mantle (hope this is the right term, the colorful part that extends outside the shell) somewhat shriveled and not open like usual. The only thing I can think of is that I might have injured him while moving some of my rocks around that day and adding some xenias, but I was pretty careful and don't remember hitting him. The part that is shriveled is opposite the small piece of xenia I placed near-by. Any ideas? I did notice also some bristle worm hitchhikers on the rock the xenia was on but removed them (at least the ones I saw) prior to placing it in the tank. (sorry for the bad pic, but you can kinda get the idea on the bottom part of the picture whats goin on) Thanks in advance for any info!