finally got a picture of one of my original hitch hikers

[tlhood]

I ended up with two almost exactly like that. I have found their molts around my sand in the morning, but have seen them filter feed. We "identified" them as porcelain crabs. They're a pale blue/green colour with pink or white under their big claws. Very shy, but I can see their fans moving around during feeding time.

Yesterday evening, (sorry to go off on a tangent) I was looking around my rocks and I guess one of them has relocated and has gotten quite huge. Scared the crap out of me when it moved. With its claws and all, it is about the size of a loonie now, though its body is still relatively small.