What Do I Need for a Small Koi Pond?

If you’re thinking about setting up a small koi pond in your backyard, there are a few things you’ll need to consider. Koi ponds can be a beautiful addition to any outdoor space, but they require some planning and preparation to ensure that your fish thrive. In this article, we’ll go over the basics of what you need for a small koi pond.


The first thing you need to think about is where you want to put your koi pond. Ideally, it should be somewhere with plenty of sunlight but not too much direct sunlight. Koi need sunlight for their health and growth, but too much can cause problems with algae growth in the pond.


The size of your koi pond will depend on how many fish you plan on keeping and how much space you have available in your yard. As a general rule of thumb, you should allow at least 10 gallons of water per inch of fish. So if you plan on keeping five 6-inch koi, you’ll need a minimum of 300 gallons.


Koi ponds can be any shape or size, but they should be at least 3 feet deep to allow the fish enough room to swim and stay healthy. A deeper pond will also help regulate the water temperature and prevent freezing in colder climates.


Once you’ve decided on the location, size, and shape of your koi pond, it’s time to start gathering materials. Here are some things that you’ll need:

  • Pond liner
  • Pump and filter system
  • Air pump and diffuser
  • Rocks or gravel for the bottom of the pond
  • Plants for oxygenation and filtration (optional)
  • Koi food
  • Net for catching fish

Pond Liner

The pond liner is one of the most important parts of your koi pond. It’s what separates the water from the ground and keeps it from seeping into the soil. You’ll want to choose a high-quality liner that is durable and resistant to tears, punctures, and UV radiation.

Pump and Filter System

A pump and filter system is essential for keeping your koi pond clean and healthy. The pump circulates the water while the filter removes debris, chemicals, and waste. You’ll want to choose a system that is appropriately sized for your pond.

Air Pump and Diffuser

An air pump and diffuser can help oxygenate your koi pond, which is necessary for the health of your fish. The diffuser releases tiny bubbles into the water, which increases surface area for gas exchange.

Rocks or Gravel

Adding rocks or gravel to the bottom of your koi pond can help create a natural environment for your fish. They also provide a surface area for beneficial bacteria to grow, which helps with filtration.


Adding plants to your koi pond can help oxygenate the water and provide natural filtration. Some good options include water lilies, lotus plants, and floating plants like duckweed.


Setting up a small koi pond requires some planning, but it can be a rewarding project that adds beauty and tranquility to your yard. Remember to consider location, size, shape, materials like liner or pumps or filters or rocks or gravel or plants ,and you’ll be on your way to creating an oasis for your fish!

Photo of author

Michael Allen