In Delbeek and Sprung (VOL 1 or 2, I dont remeber, it says mandarins have OCCASIONALLY been known to eat flatworms). Here's my story, I had some flatworms introduced, but dealt with most of them with a freshwater dip. However, Im sure I didn't get them all, as I noticed them on some mushrooms I had added weeks earlier. I do have a mandarin, and I have never seen flatworms since. Coincidence? Most likely.
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