Hey sis, there is only one method I know of that is relatively reproducible, and that is the use of praziquentel or fenbendazole (not too sure of the spelling). A little goes a long way, these are dewormers and will cause planaria to really melt away. However, do leave it for a few days in the hopes that it will penetrate through substrate, because if the dosage doesn't reach all the way through, planaria that hide inside the substrate will be fine and regenerate later on. No planaria is a hit and miss for me, sometimes it works, sometimes it doesn't. Vermex is a no no, my shrimp reacted quite badly.