20 long

20 long (20L) is a aquarists phrase used to describe an aquarium tank that holds of water and is quite 'long'.

This is typically 30" long by 12" deep by 12" high (61 cm x 30 cm x 30 cm).


 * See 20 tall (20T).


 * 20 US Gallons is 75.7 Litres.