I am a firm hater of quick fixes and additives.
But I gotta tell you...I used the
Flatworm Exit (by Salifert, I think)...and it really worked.
Killed ONLY the flatworms in the tank. All my tiny little
feather dusters lived...crabs....corals...nothing showed any sign.
one thing though...FOLLOW the DIRECTIONS carefully! They give you some extra work to do after adding the product...and it is CRUCIAL that you follow these directions.
Flatworms release large amounts of toxins when they die. If you don't get out as many dead bodies as you can...you might have problems.
But the product worked WONDERFULLY!