My guess is that the other clam imported something into the tank that the first clam wasn't prepared for. Bacterial or viral is what I'm thinking.

Sorry to hear about your clam. I had the same thing happen to me. Had him for just over a year (see avatar) , all was well one day, he was gone the next :(
I was told that using aptaisia killer (Joey's Juice) was a possible cause and I had recently used a bit.
It does seem to be quite common that when they go, they go fast

i'm kinda getting the feeling that my crocea's soon to join the club. seems to be withdrawn alot of the time and slow to react to shadowing the light...what's going on here??

feel for ya.

Don't reaaly know but might be something different than mine, since mine was 100% okay then dead probably within 24 hrs. If yours is gradual might be able to correct (though I got no idea what to suggest).

still kickin' but today is showing severe signs of pinched mantel...so freshwater dip it is. wish me luck...

uggh, this is painful watching this clam fade away. i just don't know what to do with it. i've read all i can, apparently if they're gonna go they just go, this one seems to just be suffering. FW dip didn't seem to do anything for it, i searched the shell and byssal area for any unwanteds...there was nothing. i just cannot find the source of irritation...:confused:

yup I know your pain man , I have a nice metallic blue one that i Think is on it's way out to clam heaven.:cry:

Darryl, did you read my thread on pinched mantle and the possible effects of excessive iron?

i did at that Doug, thanks for that. it's has been off now for 3 days and i've been running a fair bit of carbon as well since i turned off the GFO reactor. not sure what else there is left for me to do...at this point.

well, GL, i dont know many people that have good stories about clams, they all seem to die out if not right away, than around a year.