The freshwater field guide

A little knowledge.
A better aquarium.

Twelve practical guides to help you understand the habitat, care for the animals, and keep learning.

12 guides

Start here

Your first freshwater aquarium, done thoughtfully.

A practical beginner guide: choose the right setup, cycle it before stocking, and build habits that help fish thrive.

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Go deeper

Better fishkeeping through better decisions.

An advanced freshwater guide to stability, water chemistry, mature filtration, planted systems, and managing change.

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Water & cycling

The nitrogen cycle: your aquarium’s invisible foundation.

Understand ammonia, nitrite, nitrate, and the fishless cycling process before adding freshwater fish.

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Equipment

Aquarium heaters: stable temperature comes first.

How to choose and place a freshwater aquarium heater, check actual temperature, and reduce failure risks.

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Equipment

Filtration: choose for the fish, protect the biology.

Compare sponge, hang-on-back, internal, and canister filters for a freshwater aquarium.

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Water & cycling

Water testing without chasing perfect numbers.

What ammonia, nitrite, nitrate, pH, GH, and KH tell you about a freshwater aquarium.

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Everyday care

A maintenance routine you can actually keep.

A practical freshwater aquarium routine for water changes, filter care, observation, and avoiding disruptive deep cleans.

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Fish & habitat

Stock a community, not just a collection.

Plan freshwater fish compatibility around adult size, social groups, water needs, and available habitat.

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Everyday care

Feeding well without feeding the water.

Choose species-appropriate foods, help every fish eat, and prevent uneaten food from becoming a water-quality problem.

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Go deeper

A planted tank starts with plants that fit.

Build a manageable freshwater planted aquarium by matching plants, lighting, nutrients, and maintenance.

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Health & prevention

Fish acting differently? Start with the water.

A freshwater fish health triage guide covering warning signs, water checks, quarantine, and when to get help.

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The hobby

Your first year should build confidence—not normalize fish loss.

Why early freshwater fishkeeping can become discouraging, how preventable losses happen, and how to build a more sustainable hobby.

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