Water changes & maintenance
Calculate replacement water, estimate nitrate dilution, and keep a private maintenance log.
Plan a water change
Replace 5.0 us gallons
Estimated nitrate immediately after mixing: 30.0 ppm
This dilution estimate assumes complete mixing and no new waste. It does not set a maintenance schedule or a safe nitrate target. Match replacement temperature and treat tap water for chlorine/chloramine.
Maintenance & water-test log
Entries stay in this browser on this device. Export a copy before clearing browser data. Record readings after your change, or explain timing in the notes.
No readings saved yet. Start with today’s water test.
Supplies for a water change
A few reusable tools cover routine freshwater maintenance. Check what you already own before buying.
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- Aquarium siphon
- Choose a tube you can control and a gravel attachment suited to your substrate. Compare aquarium siphon options ↗
- Dedicated bucket
- Use a new bucket reserved for aquarium water, never one used with household cleaners. Compare dedicated bucket options ↗
- Water conditioner
- Check that it treats both chlorine and chloramine; follow the product’s dosing instructions. Compare water conditioner options ↗
- Water test kit
- Look for ammonia, nitrite, nitrate, and pH tests. Check expiry dates and refill availability. Compare water test kit options ↗
- Thermometer
- Check replacement water against the aquarium temperature before adding it. Compare thermometer options ↗
Starting from scratch? Use the beginner aquarium shopping list →