20 tall
From The Aquarium Wiki
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20 tall (20T) (sometimes called '20 High' (20H)) is a aquarists phrase used to describe an aquarium tank that holds 75.7 Litres (20 US G.) of water and is quite 'tall' or high.
This is typically 24" long by 12" deep by 16" high (61 cm x 30 cm x 40.5 cm).
- See 20 long (20L).
- 20 US Gallons is 75.7 Litres.
