Fix the water. Enjoy the fish.

Aquarium problems explained step by step, and the equipment designed for them. Research-based, beginner-friendly, no hype.

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Substrate, Plants & DecorGravel, sand and plant soil, live and artificial plants, rocks, driftwood and decor that are safe in a tank.82 guidesFilters & MediaCanister, hang-on-back, sponge and internal filters by tank size, plus the media inside them.80 guidesTanks & StandsTanks and starter kits by size and fish, and stands rated to carry them.54 guidesAir, CO2 & PumpsAir pumps and stones, water and return pumps, and CO2 systems for planted tanks.46 guidesLightingLED fixtures by tank length and use: fish-only, low-tech planted, high-light planted.22 guidesSaltwater & ReefReef and marine gear: all-in-one tanks, skimmers, powerheads, salt and auto top-off.26 guidesWater Care & TestingTest kits, conditioners, bacteria starters and treatments, each tied to the water problem it addresses.21 guidesCleaning & MaintenanceVacuums, siphons, scrapers, algae tools and buckets.22 guidesFood & FeedingFish food by species and diet, and automatic feeders for holidays.7 guidesHeaters & ThermometersHeaters by tank size and control type, and thermometers to check them.18 guides

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