Master Your Aquarium's Water Changes
The complete guide to maintaining crystal-clear, healthy water for your fish and corals. Get personalized schedules for freshwater, brackish, and reef aquariums.
Things You Need to Know
Master the art and science of aquarium water changes
Why Water Changes Matter
Water changes are the foundation of aquarium health. They remove toxic waste compounds, replenish essential minerals, and maintain stable water chemistry that keeps your aquatic life thriving.
Removes nitratesStabilizes pHPrevents disease
Optimal Schedules by Tank Type
Freshwater:10-30% weekly
Brackish:15-25% weekly
Adjust based on species and salinity needs.
Reef:10-20% bi-weekly
Keep nitrates ~0–10 ppm; nano reefs often need smaller, more frequent changes and testing.
Get expert answers to the most frequently asked questions
How often should I change my aquarium water?
Is it bad to change too much water at once?
Do reef tanks need water changes with supplements?
What happens if I skip water changes?
Can I automate water changes?
Ready to Master Your Water Changes?
Join thousands of successful aquarists who've transformed their tanks with our personalized water change calculator. Get your custom schedule now!