Heh, I'm guessing it jumped ship. I don't think you have much to worry about... just prop it back up when you get home. I prop mine up on a decent size chunk of live rock so it can be moved if need be, and so it's foot is not attacked by bristleworms as christy said. No experience with squamosa clams though, just the crocea.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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