💧
Water Change Calculator
Calculate how much water to remove and replace
10%20%30%40%50%
Water Change Guidelines
✅ Recommended: 25-30% Weekly
Most aquariums thrive with 25-30% weekly water changes. This removes nitrates and replenishes minerals without shocking fish.
⚠️ Minimum: 10-15% Weekly
Lightly stocked, heavily planted tanks can manage with 10-15% weekly changes. Monitor nitrate levels.
💧 Large Changes: 40-50%
Use for emergency situations (high ammonia/nitrite), overstocked tanks, or breeding setups. Match temperature and pH closely.
Important Tips:
- Always treat new water with dechlorinator
- Match temperature within 2°C (4°F)
- Vacuum substrate during water changes
- Never change more than 50% unless emergency
- More frequent small changes > occasional large changes
Maintenance Schedule
Weekly (25%)Every 7 days - Standard maintenance
Bi-Weekly (30%)Every 14 days - Light bioload
Twice Weekly (15%)High bioload or fry tanks
💡 Pro Tip: Download the Fishi app to set automatic reminders for water changes and track your maintenance history!