The basic rules you need to follow are. - 1 inch of fish must have at least 1 gallon of water. Every tank must have a permanently running 'cycled' filter. :- Every tank need at least 50% of its water relpaced every week. A Betta is a 3 inch tropical fish. So it needs to have heated water (Up to around 78F) and at least 3 gallons of it. Bettas should be fed tiny amounts of Betta food (pellets/flakes) morning and evening. Food must never be allowed to rot in the aquarium/tank. It will poison the water and kill the fish.
yes
3
The first rule of fish keeping is "1 inch of fish needs a minimum of 1 gallon of water" Your 'bowl' is not big enough to keep one fish healthy let alone two and a Betta. Goldfish are coldwater fish and need temperatures around 55F. Bettas are tropical fish and need temperatures around 80F so you can see that they should not be kept together anyway.Simple answer is NO. They need totally different living conditions. 1 Betta needs a 5 gallon (nominal) tank. Two goldfish need a 25 gallon tank.
well you first need at least a one gallon fish bowl and fish gravel and plants and stuff for them to hide in. fish food, and give them every once in a wile betta fish treats for fat.
betta
Yes.
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!
No, they can live alone or with other female bettas. They might bite each other but won't kill.
Male betta fish can be housed in both bowls and aquarium. In order to thrive though they need the proper lighting and filtration.
Betta are airbreathers. So long as the ammonia and nitrates are okay, you don't need filters on a Betta tank.
It is absolutely ok to have a lamp by the betta fish tank, just make sure its not on 24/7, as fish need dark and light periods to function normally.
Yes they just touch the Betta fish to paralyze it and then eat.