What was the matter with the carpet? Could it be related to your clams conditions? If you think that it could be, you could try using carbon for a little while.
I would not do a FW dip with the clams if they already looked stressed, but just giive them a little while. It is a little wierd how it has only affected the crocea's, but I would guess its a water quality issue rather than a predator.
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Rory
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