Surinder: Hi, I hear you are a goldfish expert?
Kate: I wouldn't call myself that, but I do keep fancy goldfish.
Surinder: Please can you tell me how often I need to change the water if I keep a goldfish in five gallons?
Kate: Five gallons, how much is that in litres?
Surinder: You don't have gallons in England?
Kate: Not any more. Anyone over sixty knows what they are.
Kate: We didn't learn about them in school. I know a pint is a beer glass, but how many pints are in a litre I can't remember, ten?
Surinder: Eight.
Kate: OK, well we have everything in decimal, so.
Surinder: It's about 25 litres, a foot by a foot by a foot.
Kate: Well, quite frankly I wouldn't keep any goldfish in such a small tank. Not for more than a day or so, if I had to. 
Surinder: Too small? But they are selling them for goldfish in the shop
Kate: I know about that. Still no serious fishkeeper with do this. 
Surinder: I don't want to be cruel
Kate: It isn't only about that, it is just not viable as an aquarium. You can't fit a filter or a light on there. 
Surinder: So which tak should I buy?
Kate: Get the biggest tank that you have space for, but remember they are very heavy, so only put them on strong, flat topped furniture. Then get the biggest tank you can find a good place for. 
Surinder: Then I can have more than one goldfish, right?
Kate: Yes, and that's a good idea because they like to be in company with others of their own species
Surinder: And maybe other kinds too?
Kate: Which kind of goldfish do you have?
Surinder: It is actually white with a red blob on its head.
Kate: Red cap oranda. They are supposed to represent the flag of Japan. 
Surinder: Nice! I didn't know that.
Kate: Yes. But anyway, fancy goldfish should only be kept with other fancy goldfish.
Surinder: Thanks for the info. I will get a bigger tank today.
Surinder got a fancy goldfish. His tank is too small. Kate gives him advice on the size of the tank and the place to keep it. Surinder has a red cap oranda. Goldfish like the company of other goldfish. Surinder will get a bigger tank today. 