Guide Library

Care guides, stocking ideas, and compatibility deep-dives.

Every guide and article, newest first. New pieces publish daily.

• Best Fish for a 5 Gallon Tank
• Best Fish for a 15 Gallon Tank
• Best Fish for a 20 Gallon Tank
• Best Fish for a 29 Gallon Tank
• Best Fish for a 40 Gallon Tank
• Best Fish for a 55 Gallon Tank
• Best Fish for a 75 Gallon Tank
• Best Fish for a 90 Gallon Tank
• Best Fish for a 125 Gallon Tank
• Best Beginner Fish for a First Aquarium
• Best Nano Fish for Small Tanks
• Best Schooling Fish for a Community Tank
• Best Peaceful Community Fish
• Hardiest Aquarium Fish (Hard to Kill)
• Best Coldwater Fish (No Heater Needed)
• Best Fish for Hard Water
• Best Fish for Soft, Acidic Water
• Best Bottom-Dwelling Fish
• Best Cleanup Crew: Shrimp & Snails
• Best Algae Eaters for a Freshwater Tank
• Best Fish for a Planted Tank
• Best Centerpiece Fish for a Community Tank
• Best Tetras for a Community Tank
• Best Gouramis for a Home Aquarium
• Best Livebearers (Guppies, Mollies & More)
• Best Cichlids for Beginners
• Best Aquarium Catfish
• Most Colorful Freshwater Fish
• What Can Live With a Betta?
• What Can Live With a Neon Tetra?
• What Can Live With a Guppy?
• What Can Live With a Goldfish (Fancy)?
• What Can Live With a Angelfish?
• What Can Live With a Molly?
• What Can Live With a Platy?
• What Can Live With a Swordtail?
• What Can Live With a Corydoras Catfish?
• What Can Live With a Dwarf Gourami?
• What Can Live With a Honey Gourami?
• What Can Live With a Cherry Shrimp?
• What Can Live With a Mystery Snail?
• What Can Live With a German Blue Ram?
• What Can Live With a Discus?
• What Can Live With a Tiger Barb?
• What Can Live With a Zebra Danio?
• What Can Live With a Harlequin Rasbora?
• What Can Live With a Cardinal Tetra?
• What Can Live With a Bristlenose Pleco?
• What Can Live With a Cherry Barb?
• How to Get Rid of Aquarium Algae
• How to Treat Ich (White Spot) in Aquarium Fish
• New Tank Syndrome: Why New Tanks Kill Fish
• How to Do an Aquarium Water Change
• How to Acclimate New Fish (Without Killing Them)
• Why Did My Fish Die? The Common Causes
• How to Choose an Aquarium Filter
• Planted Aquarium Basics for Beginners
• Aquascaping Styles: Iwagumi, Dutch, Jungle & Biotope
• How to Get Rid of Pest Snails
• Aquarium Heater Guide: Size, Placement & Safety
• Common Aquarium Fish Diseases & How to Treat Them
• Gravel vs Sand: Which Aquarium Substrate?
• Aquarium Lighting Guide for Beginners
• Do You Need CO2 in a Planted Aquarium?
• Driftwood in Aquariums: Tannins, Prep & Benefits
• How to Set Up a Quarantine Tank
• How Often Should You Feed Aquarium Fish?
• Aquarium Water Parameters Explained
• Betta Fish Care: The Complete Guide
• Goldfish Care Myths That Kill Fish
• The Easy Aquarium Maintenance Schedule
• Live vs Fake Aquarium Plants
• Aquarium Salt: When to Use It (and When Not To)
• How to Breed Guppies (Beginner Guide)
• Aquarium Temperature: What's Right for Your Fish?