Generally it's not. I guess the off chance of having a guppy survive their full life span in a bowl is uncommon. They need heat, around 25 degrees Celsius to stay happy, because in the wild they live in warm water. But the majority of aquariums are kept at 25-26 degrees Celsius or about 75-82 degrees Fahrenheit.
Keeping fish in those jars is as horrible as keeping a dog in a tiny cage! Do not trust pet shop owners when they say "It's fine to keep them like that". They just want to make money. Fish can live in those bowls for a long time, but they'll just suffer.
If you want to keep a fish in a small bowl the only practical choice (that is not animal cruelty) is a Betta or Siamese fighting fish. One male can be kept in 1/2 gallon, ABSOLUTE MINIMUM. 1-2 gallons is preferable. This is NOT suitable for a school locker as Betta's require light and heating to survive. Also, when you keep a fish in such a small amount of water you will need to change all of it every week, or the fish will die. Do not keep him in a bare jar, provide some gravel and plants so he is not bored or he will chew his fins off.
fish in tanks are magnified by the glass and the water.......... in my round fish bowl my guppies look huge
Guppies will survive with a school of clown loaches (Botia macracantha) for a while. Eventually they will be eaten.
NO! you will need at least 5 gallon for those
No, guppies are fish.
They could but it wouldn't be very suitable. Guppies, although small fish, produce millions of eggs, and being fresh water fish, they need to be layed in the river they inhabit. Only a handful of guppies will survive, so they need a rather big space to reproduce/
The tiger fish would eat the guppies.
Guppies are a type of fish. There are no types of guppies.
Fish that have long, wavy fins should not be put with guppies, because guppies will nibble their long fins. Also, many bigger fish will eat guppies. Keep a separate tank with guppies and a few "cleaner" fish, which do not harm guppies.
Only guppies breed with guppies naturally.
Guppies are omnivores and do OK on normal Tropical fish flakes.
Guppies are freshwater fish: Sea horses are saltwater fish
Guppies natural enemies are bigger fish. When guppies are eggs diffrent fish and sea creature will eat them.