OK, now you guys are scaring me. I have an acro colony I bought from MD. There are 2 small crabs in it, I thought they were acro crabs (is there such thing?) Are they bad? They are very small and dont' seem to be bothering anything. THe hairy ones I'm talking about are big, the size of a half dollar. I found one messing with a frogspawn last night. I tried to grab him with tongs, I ripped off a leg but he got away.