So here’s a question many fish lovers ask us. How big does my pond need to be in order to have koi? Well, we task our design experts with this everyday when designing koi ponds for our clients. So this answer is a little bit more technical then some. We are going to try and break it down so that you can do the math yourself.
 
“Ok, so why is this even important?” you may ask. “Can’t I just put as many as I want?” The answer, no. The reason this is so important is that each koi needs a certain amount of space to live a healthy life. Ponds that are too crowded can cause disease to run through the ranks of your koi. It will often hurt your larger koi and leave the smaller ones to fend off the disease as the levels balance out. No one wants to lose their prize koi. So it’s super important to know how many koi your pond can safely hold. It can also cause your ecosystem to become overloaded with the excessive fish waste. So make sure your pond is the right size for the amount of fish you have.
 
Ok, so here’s the answer. Koi and other pond fish need 10 gallons for every 1 inch in length minimum. So it would look like this. If you have one fish that is 6 inches long, you would need 60 gallons of water to survive. This can be done by estimating the size of your fish and then adding a 500 gallons extra to be safe. Now this is minimum. Some Koi fanatics will tell you it needs to be 30 gallons for every inch in length. But starting at the base is a good place to start.