As it so happened I was in Auckland over the weekend, and was put up by a relative. In her room was a fish bowl with two oranda, one very dead though Water smelled awful. Removed the dead one, and did a 30% water change. No filter running and no air stone. Managed to go to the HFF in Mt Roskill and picked up a sponge filter with air pump to at least get something going, and left instructions for daily 10% water changes until the water smelled more "sea" like, and until they could organise a larger tank. They had a seachem ammonia meter in another tank ( a large Rio where 5 goldfish had perished and was not being used as it apparently leaks ) and I moved it to this fish bowl. Ammonia read 0, but who knows how old the meter was.