Paul Krombholz wrote:
> I had some experiences a little while ago that illustrate that s
> you can see the results almost immediately, and other times, you
> to wait for several weeks.
<snip long interesting explanation of what happened in 2 of his
> At any event, I am not sure at all that soil toxicity caused the
> spotting. It could have been calcium deficiency, after all.
> What started all this was the question, how long do you have to
> could be just a a day or two, or it could be as long as a month
Another very important point that Paul's story brings up is how
easy it is, even for someone with a lot of experience, to get
confused by results when there is more than one possible cause for
a problem. Additionally, parameters other than the one the
aquarist is focused on can change in a tank leading one to a
These are two of the reasons that I'd rather use something for a
long period of time, or at least in a number of different
situations before I decide that it's an important part of my
standard operating procedure.