Bev,
Have you tried looking at night via a flashlight, I have seen one in my tank but it wasn't a priority like the hydroids. You have to be fast too, as they don't like the light. I have seen them in other tanks too, usually suspended from the rockwork trying to latch onto a snail or crab that may be crawling along the bottom. Another good indicator as you probly already know is a pile of empty shells or some rubble rock piled up that you didn't do.
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