Guides
Freshwater Aquarium Guides
Practical care and stocking articles that support the compatibility checker and species database.
Aggressive Fish Compatibility
Understand territory, predation, and tank size before mixing bold freshwater fish.
Best Beginner Fish
Start with hardy freshwater fish that forgive normal beginner mistakes.
Best Betta Tank Mates
Choose calm companions that avoid nipping and stay out of a betta's way.
Best Fish for Nano Tanks
Stock small aquariums responsibly with tiny fish and stable routines.
Betta Care Ultimate Guide
Create a calm, warm, planted setup for a healthy betta and carefully chosen tank mates.
Bottom Dweller Care
Care for corydoras, loaches, plecos, and other substrate-level aquarium residents.
Cichlid Tank Mates
Plan cichlid communities around adult size, temperament, and territories.
Community Tank Essentials
Build a peaceful freshwater aquarium with compatible fish, stable water, and enough space.
Corydoras Care Guide
Keep cory cats in groups with smooth substrate and peaceful tank mates.
Freshwater Algae Eaters
Pick algae-eating fish and invertebrates that fit your tank size and water.
Freshwater Water Parameters
Understand pH, temperature, hardness, and why overlap matters for compatibility.
How Fish Compatibility Works
Learn how FishCompat weighs water, temperament, size, schooling, and tank space.
How to Cycle a Tank
Prepare a biological filter before adding fish to a new aquarium.
Livebearer Community Guide
Keep guppies, mollies, platies, and swordtails in hard-water community tanks.
Peaceful Schooling Fish
Use groups of active fish to create movement without constant aggression.
Planted Tank Guide
Choose fish, plants, and maintenance habits that support a healthy planted aquarium.
Shrimp-Safe Fish
Choose small peaceful fish that are less likely to hunt aquarium shrimp.
Snail-Safe Fish
Avoid snail-eating fish and build a stable cleanup crew.
Stocking a 20 Gallon Aquarium
Build balanced 20 gallon stocking plans around one centerpiece and supporting fish.
Stocking a 55 Gallon Aquarium
Use a larger aquarium to combine active schools, bottom dwellers, and centerpiece fish.