Freshwater clam?

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I have ten of them. They are spread out amongst three of my tanks. They do not bother any if the fish because they are never above the gravel. The only time I see them is when i vacuum the gravel. I stir it up and they come up with it. Ten minutes later they burrow back into the gravel. Not too exciting. They are a natural filter but honestly, had I known they would never be seen, I wouldn't have bought them.

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Very informative article, thanks. I guess I'll be skipping the clams :)
 
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