nemarid

Hi Guys/Gals, I got a bit of a problem with red planaria flatworms in my PICO (25l) A mate suggested using NEMARID DEWORMER. I sucked up a few flatworm dropped them into 1l of water & added 2drops of nemarid. It seemed to kill about 80-90% of the worms. Im just not sure how reef safe it is...