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Hi and welcome! I think it's been said already in different ways, but it's recommended that you have 1000 gallons for your first Koi and more water for each additional one. The bottom line is the more fish load the more work and burden it is and unfortunately fish don't always live very long if the water quality gets bad. It's always better to start slow until you know everything. I have been doing this 10 years and still don't know everything yet!View attachment 116445 View attachment 116445 Thanks for all the information on this forum. I am a Long time fish keeper, but new to outdoor ponds. I have a 218 gallon preformed pond with 7 small koi. My plan is to move the waterfall back and add a stream.