20 long
From The Aquarium Wiki
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20 long (20L) is a aquarists phrase used to describe an aquarium tank that holds 20 US gallons of water and is quite 'long'.
This is typically 30" long by 12" deep by 12" high (61cm x 30cm x 30cm).
- See 20 tall (20T).
- 20 US Gallons is 75.7 Litres.
