after 3 months of siphoning flatworms from all over my tank ,my frustration led me to try the greenex method and all i can say is thank god for it .i have a 90g reef and not one sps or and any critters other than the flatworms suffered. i dosed 3/4 the recommened dose i ran carbon and a poly filter 3 hrs after the treatment this was wed. of last week and so far this morning all life looks great. finaly i can enjoy all my pink and purple coralline algae.i am not an advocate for medicating any of my tanks. john