Aquarium Guides
Practical guides for keeping your fish healthy. From cycling your first tank to treating disease, find clear answers without the fluff.
Featured Guides
Essential reading for any fishkeeper
Understanding the Nitrogen Cycle (Ammonia, Nitrite & Nitrate Explained)
Understand the aquarium nitrogen cycle and how ammonia, nitrite, and nitrate affect fish health. Discover how beneficial bacteria establish in your tank, how cycling works, and how to prevent dangerous water quality issues.
Fish Temperature Compatibility Guide
Match fish species by overlapping temperature ranges so you can stock your aquarium with fish that thrive in the same conditions. This guide shows you how to compare ideal ranges, understand safe overlap, and plan a stable community tank built around shared water temperatures.
Aquarium Water Temperature Guide
Maintaining the right water temperature is essential for healthy, stress-free fish. In this guide, we explain ideal temperature ranges for common aquarium species, how to choose and use a heater, and how to prevent dangerous fluctuations in your tank. Keep your fish comfortable and thriving with stable, consistent warmth.
Browse Guides by Topic
Find guides organized by subject
Aquarium Basics
Everything you need to know to get started with fishkeeping. This category covers the fundamentals of setting up an aquarium, understanding how tanks work, water chemistry basics, essential equipment, and building healthy habits before adding fish.
4 guides
Fish Care & Welfare
Everything you need to keep your fish healthy and thriving. From common diseases and treatments to water quality, stress, and prevention tips, this is where good fishkeeping habits start - with practical advice, clear explanations, and simple steps that make long-term success easier for every aquarist.
3 guides
Water Quality & Maintenance
Guides focused on keeping your aquarium water clean, stable, and safe. Learn how to test water, understand results, and maintain a healthy environment for fish over time.
4 guides
Popular Guides
Most read by the community
Understanding the Nitrogen Cycle (Ammonia, Nitrite & Nitrate Explained)
Understand the aquarium nitrogen cycle and how ammonia, nitrite, and nitrate affect fish health. Discover how beneficial bacteria establish in your tank, how cycling works, and how to prevent dangerous water quality issues.
Fish Temperature Compatibility Guide
Match fish species by overlapping temperature ranges so you can stock your aquarium with fish that thrive in the same conditions. This guide shows you how to compare ideal ranges, understand safe overlap, and plan a stable community tank built around shared water temperatures.
Aquarium Water Temperature Guide
Maintaining the right water temperature is essential for healthy, stress-free fish. In this guide, we explain ideal temperature ranges for common aquarium species, how to choose and use a heater, and how to prevent dangerous fluctuations in your tank. Keep your fish comfortable and thriving with stable, consistent warmth.
Aquarium Tank Setup Guide for Beginners
Setting up your first aquarium? This step-by-step tank setup guide walks you through choosing the right tank size, installing equipment, adding substrate and decor, filling with water, and preparing for cycling. Start your aquarium the right way and avoid common beginner mistakes.
Recently Updated Guides
Latest additions and updates
Understanding the Nitrogen Cycle (Ammonia, Nitrite & Nitrate Explained)
Understand the aquarium nitrogen cycle and how ammonia, nitrite, and nitrate affect fish health. Discover how beneficial bacteria establish in your tank, how cycling works, and how to prevent dangerous water quality issues.
Fish Temperature Compatibility Guide
Match fish species by overlapping temperature ranges so you can stock your aquarium with fish that thrive in the same conditions. This guide shows you how to compare ideal ranges, understand safe overlap, and plan a stable community tank built around shared water temperatures.
Aquarium Water Temperature Guide
Maintaining the right water temperature is essential for healthy, stress-free fish. In this guide, we explain ideal temperature ranges for common aquarium species, how to choose and use a heater, and how to prevent dangerous fluctuations in your tank. Keep your fish comfortable and thriving with stable, consistent warmth.
Aquarium Tank Setup Guide for Beginners
Setting up your first aquarium? This step-by-step tank setup guide walks you through choosing the right tank size, installing equipment, adding substrate and decor, filling with water, and preparing for cycling. Start your aquarium the right way and avoid common beginner mistakes.
How to Do a Water Change in an Aquarium
Learn how to safely perform a water change in your aquarium with this simple step-by-step guide. We'll cover how much water to replace, how often to do it, what equipment you need, and how to avoid shocking your fish. Perfect for beginners and experienced fish keepers alike.
Nitrite vs Nitrate: The Aquarium Chemistry You Can’t Ignore
Nitrite and nitrate sound similar, but they affect your fish very differently. This guide explains what each one does, which is dangerous, safe levels to aim for, and how they fit into the nitrogen cycle.
Not sure where to start?
New to fishkeeping? These guides will get you started on the right foot.
Setting up your first tank?
Start with our cycling guide to understand the nitrogen cycle.
Read the guideHaving water quality problems?
Learn the difference between nitrate and nitrite - it matters.
Read the guideDealing with sick fish?
White spots? Our ich guide covers identification and treatment.
Read the guide