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Nicole - a small pond full of koi or any other fish will require extensive water filtration. Lots of fish will produce lots of manure that can ruin water quality. The more the fish grow the more manure they produce thus more filtration that is needed to clean the water. Ideally the pond filter should be as big or bigger than the actual 'lily' pond containing the fish IF you want clear water. A fish that grows twice as big produces about 3 times more waste as when that fish was 1/2 smaller. Waste increases as the fish grows larger remember that. Install a filter that is much oversized when you build the pond and you will have fewer problems and water quality issues as the fish grow. Too many fish will be your demise and you will recognize it when your water turns cloudy.