“Acid Rain” killed your fish because acidic runoff entered the pond ALL AT ONE TIME

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The TL;DR of Acid Rain. If you’re in the North Eastern United States, acid rain COULD just possibly be a “thing”. The active ingredients in Acid Rain are Sulfuric Acid and Nitric Oxides / Acids. These are caustic compounds Acid rain is about 4.5 to 5.0 pH But normal rain is about 5.0 to 6.0 […]


“Pond Went From Green to Brown Overnight” What’s That All About?

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“Pond was green water yesterday now today its brown what should I do is this a problem.” Dr. Johnson: “I’m noticing that one, crucial piece to your post, that the water was green one day and turned brown/amber the next day. That’s a massive die off of Chlorella / green pelagic algae. There are more […]


Why is “Saving Sick Fish” $24.99? What Comes With That?

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To order:  https://savingsickfish.org/order


Doc’s Fish Health Library Available to Subscribers

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By “subscribers” I just mean, owners of the new book “Saving Sick Fish” by Dr Erik Johnson available here. I digitized part of my fish health library. I posted it online with the door locked so I’d be able to read the books from time to time waiting on my fiance to finish some shopping […]


“A Too Clean Aquarium or Pond? Why Some Mulm is Good”

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Cloudy Water in Ponds and Aquariums Water Clarity / Water Clouding is conditioned on FIVE or SIX different kinds of organism. Bacteria, Viruses, Flagellates, freshwater Protists like Ambiphrya as well as plants influence water clarity. This post answers the question: Why don’t I want to clean my pond to spotless white? Is there such a […]


“Saving Sick Fish” by Dr. Erik Johnson

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Forty page crash course with NO 'unnecessary' topics or information. You can solve fish health problems quickly and develop adequate proficiency to succeed with fish keeping and the aquarium hobby in an illustrated 2 to 3 hour read. The author provides guidance and “how to's” based on more than twenty years experience as a fish […]


The New Book Is Here

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An introduction and link to the book. http://videopal.me/page/W3vfGjG7J4CH


Saving Sick Fish: How to Save Fish FAST!

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The TLDR of Fish Health. Mastery in 40 pages. The new book by Dr Erik Johnson ( drjohnson.com and Koivet.com ) The brand new Fish Health and treatment book is available at https://savingsickfish.org/thenewbook and  https://savingsickfish.org/order If I was training a new employee for a pet shop, fish-friendly veterinary clinic, a garden center or pond company, […]


Aquarium Heaters, Cost, Pros and Cons, and Safety

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I bet you did not know most of the things in this article. Most people just know about the glass, clip on aquarium heaters, but this will open your eyes to things that are less expensive, but better quality. https://savingsickfish.org/heaters https://youtu.be/RPdrKlsTSvY?si=YdTBcM0RcS4DGTZj


“Spotless Ich” is a Thing. But it’s EASY. (Video)

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https://youtu.be/6vnZet71ZiY For some reason, Ich organisms don't cause white spots in Koi and most goldfish. I've NEVER seen white spot on Koi. At the same time, some of the hottest Ich infestations were on Koi. WITHOUT WHITE SPOTS. If you see Koi or Goldfish turning red, getting slimy and depressed, it's usually a crashing pH […]