Lessons Library

Aquarium Lessons

Learn aquarium care, setup, and design — from beginner to advanced.

Planted freshwater aquascape with driftwood, rocks, aquatic plants, and small schooling fish

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Start with a hub. Each one organizes the best lessons for that topic.

Start here

Start here roadmap

A practical path through the early decisions that shape a healthy tank.

  1. 1 Choose your setup First Aquarium Checklist: Complete Beginner Setup Guide Beginner 14 min.
  2. 2 Understand cycling Fishless Cycle Guide: How to Cycle an Aquarium Without Fish Beginner 13 min.
  3. 3 Pick beginner fish Beginner Community Fish: Peaceful Tank Guide Beginner 18 min.
  4. 4 Learn water changes Aquarium Water Change Schedule: How Often & How Much Water to Change Beginner 12 min.
  5. 5 Avoid common mistakes Beginner Aquarium Guide: Complete First Tank Roadmap Beginner 20 min.

Problem solver

What’s going wrong in your tank?

Find solutions to the most common aquarium problems.

Cloudy water Ammonia Spike in Aquarium: Causes, Fish Symptoms & Emergency Fixes Ammonia spike Nitrite Spike in Aquarium: Causes, Fish Symptoms & Safe Emergency Fixes Nitrite spike New Tank Syndrome Guide: Symptoms, Causes & Safe Fixes for New Aquariums High nitrate High Nitrate in Aquarium: Causes, Risks & Safe Ways to Lower Nitrate Algae problems Phosphate Deficiency in Aquarium Plants: Symptoms & Fixes Fish gasping CO₂ Troubleshooting Guide: Fix Planted Tank CO₂ Problems Plants melting Betta Bowl Aquarium CO2 problems Signs of Too Much CO₂ in Aquariums: Safety Guide pH too high Aquarium pH Too High: Causes, Risks & Safe Ways to Lower pH pH too low Stable Aquarium pH: How to Prevent Swings, Crashes & Fish Stress White spots Easy Fish for Beginners: Best First Aquarium Fish Filter issues Cloudy Aquarium Water: Causes, Types & Safe Fixes

New & updated

New & updated lessons

Betta Fish in an Aquarium Bowl
Beginner Aquariums
Beginner 14 min.

Betta Bowl Aquarium

Learn how to set up a betta bowl aquarium responsibly, including bowl size, heating,...

Aquarium filter beside a clear planted freshwater tank
Equipment
Beginner 12 min.

Canister vs Sponge Filter

Compare canister filters vs sponge filters for planted tanks, shrimp tanks, nano aquariums, and...

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Keep exploring with practical guides, comparisons, setup help, and troubleshooting lessons.

Betta Fish in an Aquarium Bowl
Beginner Aquariums
Beginner 14 min.

Betta Bowl Aquarium

Learn how to set up a betta bowl aquarium responsibly, including bowl size, heating, filtration, cycling, safe decoration,...

Aquarium filter beside a clear planted freshwater tank
Equipment
Beginner 12 min.

Canister vs Sponge Filter

Compare canister filters vs sponge filters for planted tanks, shrimp tanks, nano aquariums, and community setups. Learn the...

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