Fish Tank Cycling Tool & Aquarium Cycle Checker
Use the Aquarium Cycle Coach to check your fish tank cycle using ammonia, nitrite and nitrate results. It helps with fishless cycling, fish-in cycling, live bacteria starts, mature media transfers and newly filled tanks.
Check if your aquarium is cycled before adding fish
This free fish tank cycling tool helps aquarium keepers understand water test results during the nitrogen cycle. Enter your ammonia, nitrite and nitrate readings, choose how you started the tank, and the coach will explain whether the aquarium is freshly filled, cycling, possibly cycled, or unsafe for fish.
It supports fishless cycling with bottled ammonia, fish food cycling, fish-in cycling, Nitrico Goop/live bacteria starts, mature filter media transfers and source-water nitrate or ammonia checks.