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Beneficial Bacteria

A freshwater aquarium mid-cycle with a liquid test kit and filter running, illustrating how to cycle a tank before adding fish

How to Cycle a Tank: A Fishkeeper's Real-World Guide

A step-by-step, chemistry-grounded guide to cycling a freshwater tank safely, including how to tell when it’s actually done.

June 28, 2026 Â· 12 min Â· Charith Perera