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Aquarium Guides

These aquarium guides answer the questions fishkeepers ask most, in plain language and with sources from makers, universities, and extension services. They explain the steps and the trade-offs, and they point you to a licensed aquatic veterinarian when fish are sick. None of them replaces the product label or a licensed aquatic veterinarian.

Each guide lists its sources, so you can check them yourself and see where makers or universities disagree.

Good places to begin are cycling a fish tank, cleaning an aquarium filter, and choosing water for a fish tank.

How to Clean an Aquarium Filter
October 24, 2026

How to Clean an Aquarium Filter

Step-by-step filter cleaning for hang-on-back, canister, internal, and sponge filters, based on maker manuals, plus how to keep the bacteria…