Depends on the pond bottom. When the area is clay you can use a shovel and buckets of gravel and it will work. Take the shovel and using the back side make depressions in the clay about 10-12 inches across. Make about 50 of them in a circle (colony spawners). Put gravel in the bottom of each bed. See pic below. Don't create beds where sediment will wash in on the beds - like a creek inlet or drainage inlet.
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