I bought a 6-Line, I bought a Yellow "Coris" Wrasse, I bought an Arrow Crab, I bought 2 Peppermint Shrimp, I bought a Mandarin Dragonet, A Blue/Green Chromis...ALL were SUPPOSED to eat Flatworms...I've actually seen the 6-Line and Yellow Wrasse pick one up and spit it out. Apparently, the 2 Blue Velvet Nudis didn't make it either. Stinkin' Flatworms gotta' go! I hate the thought of all we go through to keep prestine water conditions and then go dump poison in the tank via Flatworm Exit.