you posibily could but i wouldn't suggest it.
You don't have to, but the Betta Fish likes it because they can sleep in the plant.
No. Spider plants are terrestrial, and if placed in a fish bowl will rot and pollute the water. They will not live more than a week or so underwater. The best plant for a betta bowl is an anubias; there isn't anything else that will really survive in a bowl, most aquatic plants are too delicate for this sort of treatment. If you want a planted underwater haven, do your betta a favour and get him a proper tank.
Betta fish need filtered and oxygenated tanks just like other freshwater fish. Pet stores that tell you that Betta fish don't need much room or filtered tanks are either ill-informed or just plain unethical. Too much current flow isn't healthy since Bettas like slow moving water. If you are putting a plant inside a tank with your Betta (and not keeping the Betta in a vase with a plant growing out of the top and the roots growing into the Betta's space), any freshwater fish-friendly plant is good. Just make sure that it is soft so it doesn't damage the Betta's delicate and beautiful fins. Don't put a Betta in a vase with or without a plant growing above it. Also, don't keep them in tight containers or small cups. This practice is cruel and inhumane!
Betta
A betta fish is the only fish that can stay in a bowl :) hope I helped :)
If you want a fish bowl fish I recommend a betta fish but, none do.
the betta fish is a very beautiful fish but maybe put them in a seperate bowl for awhile.
betta bowl. it is amazing
a betta bowl is about 12-15 inches in length and about the same in height
Java moss would probably be the best bet, as it is extremely easy to grow.
yes.
No betta fish cannot survive with a calla lily because the plant is basically poisoning the fish