Free aquarium cycling tracker
An aquarium cycle chart generator creates a dated plan for tracking ammonia, nitrite, nitrate, water changes, and cycling milestones while a new tank stabilizes.
Enter the start date, tank size, cycle method, and current test kit readings.
Use ppm values from your aquarium test kit.
Cycle Plan
Bacteria are building the capacity to convert ammonia into nitrite. Keep ammonia measurable for fishless cycles.
Current Stage
Ammonia conversion
Days 3-14
Testing
Test ammonia and nitrite every 2 days
Stay consistent with the same kit
Water Change
0%
Wait until nitrate rises
Day 0
2026-06-15
Ammonia near 2 ppm, nitrite 0 ppm, nitrate 0 ppm
Day 7
2026-06-22
Ammonia falling, nitrite beginning to appear
Day 14
2026-06-29
Ammonia clears faster, nitrite may read high
Day 21
2026-07-06
Ammonia 0 ppm within 24 hours after dose
Day 28
2026-07-13
Ammonia 0 ppm, nitrite 0 ppm, nitrate reduced before livestock
The Printable Reef Logbook gives you water testing, dosing, maintenance, and livestock worksheets you can print or save as a PDF.
An aquarium cycle chart tracks the expected rise and fall of ammonia, nitrite, and nitrate while beneficial bacteria establish in a new tank. It helps you decide when to test, when to wait, and when a water change is needed.
A fishless aquarium cycle commonly takes about 3 to 6 weeks. Seeded media, live rock, bottled bacteria, stable temperature, and correct ammonia dosing can shorten the timeline.
A cycle is ready for livestock when ammonia and nitrite both test 0 ppm after the biofilter processes a small ammonia source, and nitrate is controlled with a water change.
Fish-in cycling is riskier because livestock can be exposed to ammonia and nitrite. If fish are already present, test daily, feed lightly, use water changes, and consider a detoxifier until readings stay safe.