i have heard anecdotally that GFO can cause issues for clams. i've been running GFO for years in my tanks with clams, and haven't had any issues (crocea and derasa).
i do use a filter sock on the outlet from my media reactor, to try to catch any fines.
it could be that it stripped the water too aggressively, and it will take some time for the clams to adjust.
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Current Tank Info: A rectangular shaped money pit.
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