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Koivet Had a Forum
Forum contents and participants have "gotten with the times" and moved on to Twitter, Instagram, Facebook.

Aquameds is a mid size provider of fish medications to the koi and goldfish resources you often turn to. They support their retailers as well as the hobbyist. They have a consultation form of great utility. Retailers can also contact them through their site,

PH and PH Crash

pH and pH Crash
Written by Dr Erik Johnson
PH: When it Falls, So Do Your Fish. What Supports PH?

PH is only a measurement of the free Hydrogen ions in the water and is very, very dynamic. The pH can change overnight...In particular, the pH is prone to fall... and "crashes" are quick, and fatal. Interestingly, many people say they checked the pH last week, and are surprised to find that the pH can change overnight.

In simple terms, the pH is supported in range by the carbonate activity of the water (measured in Total Alkalinity) and when the carbonates are exhausted, or organics-overloaded, the pH plummets to 5.5 and kills filter bacteria and fish. In other situations, the pH can glide downward very slowly over months and thus your resident fish can survive a low-ish pH but the new fish you keep buying perish quickly as they enter the water with a very acid pH.

Check the pH regularly, and also, to get a grip on your 'safety net', measure the water's carbonate activity as Total Alkalinity as well. All these are simple measurements with cheap test kits.

If your pH tends to run low, like; under 7.0 all you need to do is add moderate amounts of carbonate or ph buffer, and check an hours after each application to make sure the carbonate alkalinity as at least 30-40 (that's AT LEAST)

In desert limstone areas, low pH is not the problem. Mike Anderson calls it liquid limestone, and the pH in those areas is VERY high. Carbonate alkalinity over 180 isn't nice for Koi. Causes a lot of shimi (black freckles)



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Koi Beginner
Once you've leapfrogged through this tutorial you will have a solid, working concept of the Koi hobby and what it's all about. This is done just about exclusively with video and very little written material.
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DrJohnson.com
More than koi health, this site spans all things animal, by a real veterinarian who shoots you straight.

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Fishdoc.co.uk
By Frank Prince-Iles. A UK authority who put this site together some time ago and which is still relied upon as a major source of good Koi and pond fish information

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PondCrisis.com
If you have a koi, pond or fish problem, this site takes you through twenty easy questions and at the end you know what you need to fix in your pond to create restored Koi health.
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