Maybe I'm late, But I'd say just another happy little goldfish!
I'm curious as to how these are different? I'd assume everyone uses a heater (when necessary) in the winter. If you are talking about high temperatures in the summer time, that is a very broad statement. The entire US is not just southern california and Flordia.water temp in unheated 'coldwater' setups with goldfish in the US is soo different to UK. I was assuming UK