A 20 gallon tank is an ideal size to comfortably contain multiple fish while not taking up too much space in your home. Tetra colorfusion aquarium 20 gallon fish tank kit, includes led lighting and de each of these kits includes a 20 gallon glass aquarium, one ul heater, one tetra whisper 20 filter, one color fusion universal color changing led, and two wonderland plant multipacks and one blooming white anemone.