Can clown fish live in a 15 liter tank?

Although there are several species of fish known as "Clown" most are 'salt water fish'. No species of clown fish I know of could live for long in a container holding such a tiny amount of water (3 gallons approx). That size tank is large enough for 3x1" fish or 1 x 3" fish. Put another way 2.5cm of fish needs 4.25ltrs of water. The fresh water Clown Loach (Botia macracantha) needs to be kept in groups of 4 or more and grows to over 30cm. As mentioned earlier, the other fish known as 'Clowns' being salt water fish. It would not be a reasonable proposition to set up a marine aquarium that small.