Fix the water. Enjoy the fish.
Aquarium problems explained step by step, and the equipment designed for them. Research-based, beginner-friendly, no hype.
Substrate, Plants & DecorGravel, sand and plant soil, live and artificial plants, rocks, driftwood and decor that are safe in a tank.49 guidesFilters & MediaCanister, hang-on-back, sponge and internal filters by tank size, plus the media inside them.62 guidesTanks & StandsTanks and starter kits by size and fish, and stands rated to carry them.29 guidesAir, CO2 & PumpsAir pumps and stones, water and return pumps, and CO2 systems for planted tanks.42 guidesLightingLED fixtures by tank length and use: fish-only, low-tech planted, high-light planted.20 guidesSaltwater & ReefReef and marine gear: all-in-one tanks, skimmers, powerheads, salt and auto top-off.15 guidesWater Care & TestingTest kits, conditioners, bacteria starters and treatments, each tied to the water problem it addresses.24 guidesCleaning & MaintenanceVacuums, siphons, scrapers, algae tools and buckets.17 guidesFood & FeedingFish food by species and diet, and automatic feeders for holidays.9 guidesHeaters & ThermometersHeaters by tank size and control type, and thermometers to check them.15 guides
Recent guides
Cleaning & MaintenanceBest Aquarium Glass Cleaners: Magnets, Pads and a Cleaner Spray
Substrate, Plants & DecorBest Aquarium Plants for Beginners: Easy Species and Their Care Needs
LightingThe Best Planted Aquarium Lights by Tank Length
Filters & MediaBest Sponge Filters for 2026: 8 Picks for Betta, 10 and 20 Gallon Tanks
Air, CO2 & PumpsBest Battery Backups for Aquariums: Air Pumps and Power Stations
Tanks & StandsBest Betta Fish Tanks for 2026: 8 Kits From 2.5 to 20 Gallons
Useful reading from Fishkeeping
Tank Setup & CareHow to Clean a Betta Fish Tank With Your Betta Still In It
Tank Setup & CareHow to Take Care of an Aquarium: A Beginner’s Daily, Weekly and Monthly Routine
StockingHow to Choose Fish for a Tank: A Beginner’s Checklist