Ive been told by the pet shop to put *aquarium tonic salt* 2 teaspoons in the water in my new gold fish tank.

My new tank is 34 litres (7.5 gallons), is this big enough for one fish. and the pet shop told me to put 2 teaspoons of tonic salt in the water and let it stand over night before i move my fish into it. (i only have the one goldfish aged 13 yrs, and the other tank was a bit smaller).
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