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oh, that makes sense, it was in the middle of the tank somewhat submerged in the substrate with a small rock under it for it to hopefully attach to. i thought i was going crazy or something.
Naw.....I have a derasa clam that moved several times until it 'found' a place to settle.
I recently got a smaller sized crocea that moved over a couple of inches....and then I think the naughty tangs may have swam past it too fast because it was also turned 90 degrees from how I placed it.