“How long until my pond is ready for fish?” is the single most common question about cycling, a new pond establishing its bacteria colony for the first time.
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The Honest Timeframe
Typically 4 to 6 weeks, sometimes longer in cold water, since bacteria grow more slowly at lower temperatures.
How to Know It’s Done
Ammonia and nitrite both testing at zero, with nitrate present, is the standard sign a pond has finished cycling.
