My experience
I had flatworms in my fuge for a good 12-14 months.. I never saw a single one in my main tank.. I beleive it was my 6 line that was taking care of them. About a month ago, flatworms entirely disappeared in the fuge.. I even dipped a small rock in water to test if any were present.. None.. I am almost starting to think that maybe flatworms work in some kind of cycle. They will thrive for only a certain amount of time in one specific area and if there is no where new to move on to, they will slowly die out.
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