There was a small brittlestar in one of frag containers I brought home. I dropped it into my tank and my Melanurus wrasse gobbled it up before it hit the bottom.
+1 for dipping everything! In addition to the pests already mentioned, Asterina stars are another organism I try to keep out of my tank, and I found several tagging along in the items I was fortunate enough to bring home.
Big thanks to those who provided my new frags, and extra grande thanks to Bob and Tammy for allowing us to invade their beautiful home!