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Nonphotosynthetic filter feeders, I believe, and thus would be pretty darned hard to keep alive. I've seen them diving all of the time, and they were always on silty, muddy bottoms. This is not typical in most aquaria! Disclaimer: most of my experience with these guys is in temperate -- cold -- water. I've run into a few in the tropics but not many.
My vote: stay away.
Dan
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