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Goldfish are not koi and do not get a big as koi thus goldfish do not produce the same amount of waste products per fish as a koi. Your situation was near a balanced situation. Potted plants are biofilters. A small pond "full of koi" is never a balanced situation unless there is a huge amount of some sort of water filtration.

Goldfish in normal conditions do not roil the water as bad as koi(carp). Goldfish and carp feed differently. Carp typically feed in the bottom with their snout into the sediment up to their eyes. Pond conditions and habitat can be a lot different between two ponds with different fish species and amount of body biomass. A fish pond can never have too much filtration but it can easily have too little filtration. When ever small fish ponds have water quality or clarity problems it is almost always due to too little or inadequate filtration.