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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,

Hydrogen Sulfide Facts and Myths

Hydrogen Sulfide - Not Very Common
Written by Dr. Erik Johnson
Hydrogen Sulfide gas is a gas produced in an-aerobic pockets under water. These may occur anywhere there is deep sand or sediment, or in a sump with thick mulm.
Without Oxygen, some bacteria can respire by using Sufur, and this creates Hydrogen Sulfide, H2S which is very, very toxic to fish.
HACH Chemical has a test for this, (1-800-227-4224) but this should be suspected in any case of fish loss where:
1) There are no parasites, proven by microscopy,
2) There are no real Ammonia or Nitrite derangements
3) The signs are respiratory and
4)The history has some reference to a stalled filter or the stirring of stagnant gravel or media.
5) NEUROLOGICAL signs, of spinning, flipping and fearlessness may be seen just before death occurs.
The smell is one of rotting eggs. Losses may be great and they will continue after the H2S is long gone. If you discover or suspect H2S poisoning, you should REMOVE THE FISH before disturbing ANY gravel or sand. Also, to neutralize SOME of the hydrogen sulfide, a weak dose of Potassium permanganate may be effective. Still, housekeeping, and finding the source of the anaerobic bacteria is the priority.
I've heard from a LOT of people that Aquascape ponds have Hydrogen Sulfide problems. I have tested dozens of these, especially the older ones since they are the most lored to have a problem - and have found NO H2S. My kit is the pad test from Hach. H2S is not an issue of pond TYPE but purely of pond maintenence.


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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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