Free tool
Cycling tracker
Cycling a new tank is a waiting game with three stages — and it's hard to tell where you are. Log your readings and we'll tell you which stage you're in, what's normal, and when it's finally safe to add fish. Your log saves in this browser.
You're cycling:
Your data stays here. The log is saved only in this browser (localStorage) — nothing is uploaded, and there's no account. New to cycling? Read the nitrogen cycle first. The completion test: your tank turns a ~2 ppm ammonia dose into 0 ammonia + 0 nitrite within 24 hours.