Getting rid of copepod eating flat worms?

[KonradTO]

Sorry to revive an old thread. Did anyone had problem with those flatworms? I always had them in my tank, they seem to somewhat thrive on something else other than copepods. When I add copepods they go hunting them really quick. I have seen them today catch the first ones after 20 seconds I added the pods. The copepods are not scared by them so they slowly get closer and snatch them