Recheck the result, review the nitrogen cycle, recent stocking, feeding, and filter disruption.
Freshwater aquarium Ammonia guide
0 ppm is the normal target for an established aquarium. Track repeated readings and recent care instead of treating one number as a diagnosis.
A zero reading is expected in an established, functioning biofilter.
ppm · Content reviewed 2026-09-02. Verify urgent livestock, dosing, and treatment decisions with qualified sources and product labels.