Yeah keeping them in bowls is really bad, a lot of people now days (particularly in petshops) still don't realise how bad it is for the goldfish to keep them in small unfiltered bowls. Even a 10gal tank with a filter and weekly water changes will give the goldfish a much better quality of life- goldfish can easily live for 20-30 years if given a suitable tank set up, in a bowl though most are lucky to live past one year.I had it for nearly 2 years in a large surface area bowl.
If the bowl was cleaned everyday that would have helped, but a bowl is simply too small for any goldfish. It is the equivilent to keeping a cat in a cardboard box its entire life...A bowl is no place for a fish which could potentially grow to 8-12inches long or more.Well Nemo used to be cleaned everyday
The best thing is to go by the 1inch of fish per gallon guideline for this tank when it comes to young and small goldies. I'm not sure about fancy goldfish, but i know that slim type goldfish grow around 1inch evey 3-4months (they grow faster when they are juveniles and slower as they mature towards their eventual size though). So if you get 5 1inch long goldfish, you'll need a larger tank for them in about 3-4months time .Well I'm was thinking of getting 5 gold fish and while they are small keep them in the large box (dimensions above) and then move them after they get bigger maybe 2 in one. And if they get really big then each in there separate big box.
25"x15"x6" dimensions I worked it out and the box was about 10 gallons
I don't know about the shape thing, but i'm sure the goldfish must get bored living in such a small environment which has so little options to make it more interesting.Speaking of bowls tokis i seem to remember reading something a while ago regarding them being bad for the mental heatlh of the fish because of the shape of the glass (although I'm not sure if thats right or if i didn't just hear half a conversation)