Hermit crabs can harass a Clam to death. Yopu say it is in a place with "a lot of flow". That is not good. The Mantle should barely move in the current. Derasa should stay on or near the bottom on rock or on sand. low flow is best barely moving the mantle. Crabs are Evil!
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I wonder how much salt mix I would need to turn our in ground pool into a Reef. 
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