Don't know how long does it takes eggs to hatch out . With no ill effect on any of my live stock I was certain to run another treatment just to be on a safe side
How ever I never spotted any flat worms after 1st treatment . It's pretty much how safe to feel to run a chemical experiment . As I mentioned a lot of folks would just add a wrasse in the system with hid or miss chance and sometimes they do consume a lot of flatworms .
I don't plan to run another 3 rd dose unless required .