Author: Dr. Erik Johnson

Dr Erik Johnson is a Marietta, Georgia Veterinarian with a practice in small animal medicine. He graduated from University of Georgia with his Doctorate in 1991. Dr Johnson is the author of several texts on Koi and Pond Fish Health and Disease as well as numerous articles on dog and cat health topics.
07
Nov
2019

KHV Koi Herpes Virus Versus Spring Viremia of Carp

Overview: Koi are generally hardy fish. They’re descended from the common carp and are tough, essentially omnivorous…

07
Nov
2019

“Carbonates” Support pH, But Can Be Exhausted

Carbonate balance is a long subject, but I intend to keep it brief. I will over simplify…

07
Nov
2019

Water Changes for Health, and Ammonia Control

If fish are suffering illness due to any obvious deterioration of water quality, you are well advised…

07
Nov
2019

Hydrogen Sulfide Pond Gas – Not Very Common

Hydrogen Sulfide gas is a gas produced in an-aerobic pockets under water. These may occur anywhere there…

07
Nov
2019

Carbon Dioxide in Aquaria and Ponds

Carbon dioxide is produced by the respiration (not photosynthesis) of both plants and animals. When you exhale,…

07
Nov
2019

Live Plants and Koi For Algae Control

Koi and plants do fine if the plants are abundant enough. If you “try” one or two…

07
Nov
2019

Veggie Filters: Algae Control Naturally

The prime competitor to algae is simply other plants. All pants consume nitrogen and phosphorus and iron….

07
Nov
2019

Algae Control: Green Water Algae Bloom

Algae Control, Green Water Bloom. This is an old video with good, current information. Crude in it’s…

07
Nov
2019

Why Algae Matters: Green Algae Blooms

Algae matters because it can obscure your view of the fish and also, string algae can choke…

07
Nov
2019

What Is Algae?

Algae are single celled plants. They occur in primarily two forms, one form composes strands which can…

Tannin Stains or Yellow Water and It's Treatment
07
Nov
2019

Tannin Stains or Yellow Water and It’s Treatment

My pond is about 3 months old. The water is clear but has a yellowish tint that…