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Nubi's have like lil bristles on its head for filter feeding , and I don't think that can flatten out like that . I've seen a few and they look nothing like that thing ... It looks GIGANTIC !
Ouch! Didn't sound good but it's kind of pretty so had to ask! So if there is one...does that mean there are more? Sorry for the questions but just curious!
There most likely are more, just not such big ones. Look for tiny things that look the same way. I have never seen such a big flatworm! They can infest mushrooms if you have any.