This is an old video with good, current information. Crude in it’s cinematography, but full of good information. Greenwater is basically just that: Green Water which obscures your view of the fish, but is healthy. It is a product of nitrogen fuel, fish, sun and a failure to have competition from live plants. Chemistry is not the cure. You will do well with a pen and paper as the video presents a lot of information FAST.
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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.