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I would not keep a clam in a bowl for any length of time, but it would be okay for a bit, probably. I suggest putting tank water in the bowl to put some bits of food in the water column for them.
Really, the biggest issues with clams are:
If they are wild, they have sucked up any toxins that may have been present in the water. For example, in a place where mercury is a problem, clams will likely be loaded with it. This stuff then has a chance of being released into the small, confined area of your tank.
They breed by spreading larvae that attach to the gills of fish. In theory, this doesn't hurt the fish, but there is the possibility, in such a confined space, of the larvae attaching in too great of a concentration, making breathing difficult for the fish.
I have taken this chance before. It didn't pan out. The clams died after a month, so I can't tell you how realistic these concerns are.
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