I've been fortunate as well for hitchhikers....let's see what have I gotten? I've gottena nice 4" (leg to leg) chocolate brittle star(thanks Brandon), a small reef safe lobster(thanks Tim), zoas, snails, some kind of monti, ricordia, and some Kenya trees(Tim). Fortunately nothing bad yet!! I bought one of those colonies from Tim at Westside and he noticed a small unknown type of crab wedged inside the one I was going to buy and he asked me if I wanted him? I said hell NO! I don't like unknowns in my tank!!! LOL