Although people usually get that one fish in a bowl for a gift, that doesn't mean that the situation is idea. I have previously written about how to care for that goldfish bowl, however, that doesn't mean it is the best way to go about housing a fish.
Fish, especially goldfish, give off lots of waste products. These waste products, of course, stay in the water - their living environment. These waste products turn to ammonia if not properly filtered out. The ammonia is toxic to fish, burning their gills and eventually killing them if not removed.
Although housing a fish in a bowl can be done successfully, it take great diligence to constantly change the water in the bowl as mentioned in my other article. The easier way, is to have a small tank with a filter in it that can help remove the dirt, waste and ammonia. The tank will still need water changes and the filter media will need to be changed. However, by using a tank with a filter, you can be a bit more lax in how often you change the water.
Goldfish are dirty fish and they should not really be kept in goldfish bowls. But if you do proper maintenance and care for your goldfish it can be done.Goldfish bowls are just too small and there is no filter or air. If people are looking at taking care of their goldfish and having your new pet for a long time they should really invest in like a 10-20 gallon aquarium. By having more water your goldfish will be healthier and hopefully live a long healthy life.There is nothing wrong starting off with the goldfish bowl but usually it's not long before people usually get hooked on the hobby and get a bigger tank.