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Daily comparison helps you catch trends early. A single reading may look acceptable, but a rising ammonia trend over several days signals a developing problem before it becomes dangerous. Catching changes early gives you more time to respond.
Any increase in ammonia or nitrite above zero is concerning. A pH swing of more than 0.3 in a day is stressful for koi. Temperature drops of more than 5 degrees F in 24 hours can trigger immune suppression.
Focus on the arrows and highlights. Rising ammonia or nitrite means your biological filter may be struggling - reduce feeding and consider a water change. Falling pH may indicate low KH buffering capacity.
Yes, test at a consistent time for the most meaningful comparisons. Water parameters naturally fluctuate throughout the day (pH rises during daylight hours with plant activity). Morning testing before feeding is ideal.
Good water parameters do not rule out disease. Fish can be affected by parasites, bacterial infections, or stress that do not show up in basic water tests. If behavior is abnormal with good water, consult a koi veterinarian.