I have been pondering what to do about the longevity of the macro solution. It starts to smell very bad after only a few days. Not a problem for me since it is in an enclosed container, I am just worried that it might harm the tank inhabitants, and/or lose its effectiveness.
Adding Excel hasn't helped.
Here's what I am going to do: Set up a few solutions with the various ferts (one chemical per solution) and see which one it is that makes it smell bad.
For example, if it is the Potassium Sulfate that's causing the deterioration, switching to Potassium Chloride might resolve the issue.
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