I bought 2 almost 4 weeks ago. Both are doing fine.
However, if you read my post somewhere /w pics in this forum, the big one ~6.5" lost its byssal gland. It was only hanging on by a tiny thread, so I said, what the heck and I sliced it off (the whole dang thing... looks like a tongue). LOL! I feared it got ripped off during the harvest. I'm still not sure if it was or not but it's still alive and very healthy looking.
Alas, I discovered my tank has a lot of pyramid snails after staying up till 2-3am after introducing my new gold tear drops. So far so good, the population is still low but sooner or later, I'll have to remove all my clams (12) into a barebottom QT.
James