Ok so we have now got a more suitable fish tank (we were wrongly advised to get a round one before, long story) its almost square and is 48litres, it has two lights, one white and one blue (apparently to be like the moon) it has a venturi effect filter (like i know what that means!!), a heater with thermostat and we have also got a pump to blow bubbles into the water from below.
Now my dilema is whether to have cold water or tropical, I have been told tropical are easy enough to care for but im not convinced and reckon a few nice goldfish would look lovely. I am going to fill it with water tomorrow then leave it for 8 days before buying the fish.
Many thanks for your help and advice guys