What is the recommended fish tank size?
For a first aquarium the recommended size should be no smaller than 20 gallons (80 Liters) ideally larger. A 29-gallon or 30-gallon (~120 Liter) aquarium or larger is a great size for the first-time hobbyist.
Can a tank be too big for a fish?
One common misconception is that fish grow to the size of their tank. While this may be true for some species, it is not the case for most. Most fish will die before they outgrow their tanks. You can prevent early fish death by giving them sufficient space and proper care.
Is 5-gallon fish tank too small?
A 5-gallon tank is the smallest you can have for successful fishkeeping. The environment and water quality in very small aquariums quickly become unstable, jeopardizing the health of your fish, and even the smallest fishes need space to swim around.