I have ten goldfish and two koi what size tank do need?

To determine the appropriate tank size for your ten goldfish and two koi, you'll need to consider several factors, including:

1. The full-grown size of your fish: Goldfish and koi can grow quite large, so you'll need to make sure the tank provides enough swimming space.

2. The activity level of your fish: Goldfish and koi are both active swimmers, so they'll need a tank that allows them to move around comfortably.

3. The number of fish you have: The more fish you have, the larger the tank you'll need.

As a general rule, you should provide at least 20 gallons of water per goldfish and 100 gallons of water per koi. So, for your ten goldfish and two koi, you'll need a tank that holds at least 420 gallons of water.

It's important to note that these are just minimum requirements. If you can provide a larger tank, your fish will be even happier and healthier.

Here are some additional tips for choosing a tank for your goldfish and koi:

* Choose a tank that is at least 3 feet long and 2 feet wide.

* The tank should have a cover to prevent the fish from jumping out.

* The tank should be equipped with a filter to keep the water clean.

* The tank should be kept at a temperature between 65 and 75 degrees Fahrenheit.

* The tank should be placed in a quiet area away from direct sunlight.

By following these tips, you can provide your goldfish and koi with a healthy and comfortable home.