Sarah,
Very nice looking specimen!
Did you place the clam directly on the substrate? Barry N. at ClamsDirect suggest a flat rock or a shell for their foot to rest on. Protects them from a bristle worm attack.
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Currently tankless.
20 Gallon mini reef with mated pair of Maroon Clowns given to Rougiem!
80 gallon reef given to Rougiem/Wooster HS.