Adding Fish To Your Pond
There is a formula to calculate how many fish go into your pond. The answer is somewhere between 1/2" to 3" per 9 gallons of water. So if you have a 500-gallon pond you may want to play it safe and consider 10 to 30 fish as long as your ecosystem is balanced. Most people start out with just a few fish and add a few more as time goes by.
What do you need to do add fish to your pond?
Pond Filter: Pond Filters are generally required to keep a Garden Pond or Water Garden healthy and clear.
Pond Pump: Pond Pumps are re-circulating, and most often submersible pumps that power Waterfalls, Water Fountains and Pond Filters in garden ponds. Pond Pumps are the heart of the pond and should be chosen with care. If your pond already has a pond pump and a pond filter then you need to think about your Pond Plants.
Pond Plants will help reduce the number of nutrients in the water as well as provide shade over the surface of your water. Reducing nutrients and providing shade will help reduce your risk of getting algae in the future. You will always want to use dechlorinator when adding water to your pond. After you have your pond filled with water and your pump and filter are running you'll want to add Beneficial Bacteria.
Beneficial Bacteria helps to keep your pond looking clean.
When you've gotten to this point you are going to want to check the pH. You always want your pH to be neutral. It is best to test your pH early in the morning for a more accurate reading. After that is all said and done you can add some Pond Fish. Since you said that your pond is small I would recommend getting goldfish and not koi fish. Koi get up to 3 feet in length and a small pond would not be suitable.