Lessons Library

Aquarium Lessons

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

Aquascaping lesson library scene with planted aquarium, open books and study materials

Main guides

Explore the main guides

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 aquarium.

  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 aquarium?

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

Lesson library

Browse all lessons

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

Keep learning

Save lessons. Track your aquariums. Keep learning.

Create your free account
Scroll to Top