Will goldfish get through plant roots close to koi do within fish ponds? ...

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Answers:    not as much.
Fish get bored similar to 4yr olds.
Toprotect your plant roots from the mischevious koi
use big onion bags around the submerged pots or plastic bird netting.
A line it will discourage them enough to contribute the plants a chance to thrive.

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No

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