I'm using tap water for my tank because I don't have any other options right now. With weekly water changes, I can predict when I'm going to have cyano problems down to the day because of it.
Whenever there is precipitation, or a lot of snow melt, I end up with algae problems within 3 days. Spring melt = fluctuating diatom outbreaks (high silicate mountain run-off), summer storms and mid winter chinooks = cyano flare ups (agricultural run-off).
not saying that's what happened there, but tap water is pretty inconsistent.
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