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Came with the live rock. It moved right out front and center when I had the lights off for a few days to deal with red algae but it usually stays in the shadows near the bottom. Less than an inch long and sometimes shrinks to almost nothing.
That is quite an odd nem. Hides from the light, and almost transparent. At least it's too small to eat your fish. There are azoox nems, but I can't find a reference for one that looks like that. I would be interested to know what exactly it is.