The library
Guides
55 guides to tank setup, water chemistry and fish care.
55 guides
ProblemsWhy Is My Aquarium Water Cloudy? (and How to Fix It)
WaterHow Often Should You Change Aquarium Water?
WaterTDS in Aquariums: What It Means for Water Quality
WaterReverse Osmosis Water in Aquariums
ProblemsPop-Eye in Fish
BeginnerHow to Sex Guppies, Platies and Mollies
EquipmentHow to Set Up an Aquarium Sump
WaterHow to Lower Aquarium pH Safely
BeginnerFish Tank Compatibility: Choosing Tankmates
ProblemsColumnaris in Fish: Signs and Treatment
EquipmentChoosing Aquarium Substrate
ProblemsVelvet Disease in Fish: Signs and Treatment
ProblemsHow to Get Rid of Pest Snails in an Aquarium
BeginnerHow to Set Up a Nano Aquarium
WaterHow to Raise Aquarium GH and KH (Hardness)
WaterHow to Cycle a Tank Faster
ProblemsDropsy in Fish: Causes, Signs and What to Do
EquipmentCO₂ for Planted Tanks: Setup and Safe Levels
EquipmentAquarium Lighting for Plants
ProblemsWhy Are My Fish Dying? Common Causes and Fixes
BeginnerHow to Move a Fish Tank Without Losing the Cycle
BeginnerHow to Breed Guppies (and Control the Fry)
ProblemsFin Rot in Fish: Causes and Treatment
BeginnerThe Best Fish for a 10-Gallon Tank
EquipmentThe Best Aquarium Test Kits
WaterAquarium Water Testing: What to Test
EquipmentAir Pumps: What They Do
ProblemsSwim Bladder Disease in Fish: Causes and Treatment
BeginnerHow to Set Up a Betta Tank
WaterHow to Raise Aquarium pH Safely
BeginnerHow to Clean an Aquarium (Without Killing the Filter)
BeginnerBest Fish for a 20-Gallon Tank
EquipmentAquarium Lighting for Beginners
EquipmentAquarium Heaters: How to Choose and Use One
WaterAmmonia Spike: What to Do (and Why It Happens)
WaterTap Water and Dechlorination for Aquariums
BeginnerQuarantine Tank Basics: Why Every Keeper Needs One
WaterpH, GH and KH Explained (Simply)
WaterThe Nitrogen Cycle and Cycling a Tank
ProblemsHow to Treat Ich (White Spot Disease)
BeginnerHow to Set Up a 20-Gallon Tank
BeginnerHow to Set Up a 10-Gallon Tank
WaterHow to Lower Nitrate in an Aquarium
EquipmentHow to Choose an Aquarium Filter
BeginnerHow to Acclimate New Fish (Float and Drip)
BeginnerHow Often Should You Feed Fish?
WaterHow to Vacuum Aquarium Gravel (the Right Way)
BeginnerFishless Cycling: The Kindest Way to Start a Tank
BeginnerYour First Aquarium: A Complete Beginner's Guide
WaterFilter Maintenance: Clean It Without Killing Bacteria
BeginnerBest Beginner Aquarium Fish
BeginnerThe Best Beginner Aquarium Plants
WaterAquarium Temperature Stability: Why Swings Harm Fish
WaterAquarium Salt: When to Use It (and When Not To)
ProblemsAquarium Algae: Types and How to Fix Them