Big Tom, very good! This is exactly the substance which is very helpful with Oodinium and – as far as we know – without any noxious effects, even if taken in the the double amount. And Aldrich is exactly the company which we got the substance from in Germany too. You only have to mind three things:
[i]1. You need very small amounts. Take the smallest bottle they offer.
2. You must store it in the refrigerator. In normal room atmosphere you can throw it away after three months.
3. The fresh substance is a light yellow powder. In the aging process, it becomes a dark yellow and at last brown and dark brown. When it has a brownish tinge, you can forget it. It will no longer be useful. So keep it fresh by storing it cold.
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Your information is very helpful for all people, especially in the U.S., wo formerly asked for “Hexa-Ex” or “Spirohexol”. As I told in that other posting before, one can forget the new liquid forms sold bearing those names. The best is to use that powder, dissolve a knife’s tip in water and give it in the aquarium. We never experienced any harm.
But do that early enough. Prevention with new fish is good. In later stages of Oodinium even that forveful substance will not ne able to help sufficiently.