Randy Holmes-Farley
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My Tank Thread
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^ How are you going to measure usefulness, and what determines whether it is useful?
Careful observation of the aquarium creatures for any apparent "benefits" after starting to dose compared to previously not dosing.
If I cannot detect a benefit, I can't see a reason to keep adding it unless there is some scientific evidence that it is useful for something I wouldn't see (which isn't, at the moment, the case for these two).