10 long
From The Aquarium Wiki
10 long (10L) is an aquarists phrase used to describe an aquarium tank that holds 38 Litres (10 US G.) of water and is quite 'long'. This is a fairly uncommon tank size.
This is typically 20" long by 10" deep by 10" high (50.8 cm x 25 cm x 25 cm).
- See 20 long (20L).
- 10 US Gallons is 37.9 Litres.