[Myka]

I doubt that crab came in on the anemone unless the anemone was attached to a rock then maybe the crab was in the rock. Either way most crabs (even the so-called reef safe ones) tend to cause some or a lot of grief at one point or another so it is usually best to remove them. I always try to find a home for hitchhiker crabs or I put them on a rock in the sump and give them a bit of food everyday.