Kilograms, unless it is like a goldfish bowl!
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The mass of a fish tank should be measured in kilograms.
No - kilograms are units of weight - not volume !
Litres. (L)
The unit typically used to measure the amount of water in a fish tank is liters (L) or gallons (gal).
There are several simple to use 'Test Kits' available at most pet shops.