I have a few Crab hitch hikers on my rock, but I didn't want to dip the rock because I didn't want any of the good guys to die. But man these guys are pure evil. They are trying to eat EVERYTHING! I was just watching my one Gorilla Crab pouncing on top of my poor little porcelain Crab (One of the guys I want to keep). I have to get these guy out now. I am going to throw them in my fuge as soon as I get it built.