Start with aquarium starter kits, which shows what each Aqueon, Tetra and Fluval kit includes and what you still need. Habitattitude, backed by the U.S. Fish and Wildlife Service and NOAA, notes larger tanks are more stable. Comparing brands? See Aqueon vs Tetra and Fluval Flex vs Spec. Keeping a betta or goldfish? Read betta tanks and goldfish tanks first.
Gear guides
Aqueon, Tetra and Fluval kits compared by size and contents, plus what every kit is missing.
What UF researchers and Aqueon say bettas need, and small tanks, heaters and filters that fit.
Fluval's two all-in-one nano kits compared from official specs.
Aqueon and Tetra glass tank kits compared by contents, filter and heater.
How much room and filtration goldfish need, how big they get, and why you must never release them.