How’s this for evidence? I had Monti Eating Nudibranchs a few years ago, the only pest hunters in the tank at the time were a trio of Pink Streaks and within a short period of time (It’s on the Random Nano build thread, just after I upgraded to the 3 foot custom made) they were gone.
And my Macro Tank is the same, never found a single planaria in there (I know they enter because I’ve seen them on the macros I add - I leave them be as I know the fish will handle them).
An awful photo of my Female Pink Streak (I still have the pair) after hitching into the 78ltr on the Macroalgae.
And the Macros