6 Algae-eating Pond Fish 6 Algae-eating Pond Fish By just selecting specific pond fish, you can easily control the amount of algae that grows in your backyard pond. Algae is a green film that is the result of a collection of microscopic plants that contain chlorophylla, and it is part of any type of pond. Algae live and grow in stagnant water and can quickly fill an entire pond if the conditions are right and nothing is done to prevent it.
Goldfish require about 20 gallons of water per fish. While a pond can never be too large, it can easily be too small if you have several very large goldfish. The fish should be able to easily swim in the pond without bumping into one another or into pond ornaments. Because goldfish are cold-water fish, they generally should be in a pond that is shaded.
Rosette or Golden rudd. A Rosette pond fish, also referred to as golden rudd, is family of the cypriniformes. In large ponds this fish may grow to be as large as 8 to 14 in. You can recognize a Rosette by its red fins and back as well as by silver to pink belly and sides. A Golden rudd is a strong fish by nature, which will not fall ill easily.