Sometimes we prepare our water to do a water change, but we get too busy to actually perform the maintenance. Instead, our water sits for several days, or even a couple of weeks, before we can get to it. The water, as long as it is being circulated, will be fine to use. However, algae may build up in the container and other contaminants might also get it. If you are in doubt, toss the water and start over.
Tip of the Day 11/28/2010
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