I would work on creating a refuge for the minnows. Large pile of trees with tight branches and weed beds. Give the minnows a place to hide and stay safe. Then right close by give them places to bread and multiply.

I have read that 15% of a pond needs to be given for this to help with its own self sustainability.

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.