Unless you spend great amounts of time looking at your tank after lights out, you probably have no real idea how many unknown hitch-hikers are in your live rock. Most of the crabs & other hh only come out at night.
For instance, even the emerald crabs & black porcelain crabs I bought & keep in my wife's reef tank are never seen except once in a blue moon. I see one occassionally but that's only usually after 2am & seen by the blue LED moonlight.
Anthony
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