Everyone,
It's great to hear that he's probably not gaping anymore. In the beginning, it's mantle receded to about a cm from the shell at both ends.
I don't really know what happened to the rest of the clams from the same shipment at that LFS. After a couple of trips since then, all were gone. I wish I had a big enough tank to house them all.
Thanks again for all your advice and kind comments.
Minh,
I've read many of your posts and have enjoyed browsing through your website. I've also heard that you're quite the guru when it comes to Tridacna. I hope everything goes well with your new system.
seamaiden,
Thanks. I bought it for my wife, and I get to play with it every once in awhile.