Water Change Calculator
Simulate how your aquarium parameters change with partial water changes.
Result
After 1 change --
Evolution per change
| Change # | Value after |
|---|
Recommendation: 10-20% weekly for most reef tanks.
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Frequently Asked Questions
What is the ideal water change frequency?
For reef tanks, 10-20% weekly is most common. Tanks with high bioload may need larger changes.
Do water changes replace dosing?
Partially. Water changes replenish trace elements and help maintain parameters, but SPS tanks usually need supplemental dosing.
Do I need to change water if parameters are good?
Yes. Even with stable parameters, water changes remove dissolved organic compounds and replenish trace elements that tests don't measure.
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