I'm setting up an 80 gal tank for the seahorses. I have a while for it to cycle; I want to use most of the rock and corals from the 30 gal. But I have flat worms in the 30. I've used (can't find the bottle now Got it from the LF, said it was what they use and works great). Well I have treated the tank 3 different times, and after a week or so, still have a zillion flatworms. What would be the best way to make sure I don’t bring these into the new tank? I don’t want to kill off the rock, but will if I have to.