When I kept clams in my BB tank, I sat them on the bottom of the tank mounted on one inch sections of 2 or 3 inch PVC pipe depending on the size of the clam. They will attach to the PVC ring but can still be moved to facilitate siphoning of detritus, etc.
Sure, clams will thrive. Despite popular opinion, there are ALWAYS nitrates in the water, no matter how clean the tank is or what our limited test kits say!
Highlander has good advice - BB is fine, just have something for them to attach to..
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