No, they can live alone or with other female bettas. They might bite each other but won't kill.
Yes.
most of the time but with betta fish no they can live at room tepature
yes
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.
Siamese fighters (Betta splendens) are a tropical fish and need to be kept at around 78F.
No. They need very different water parameters.
A betta fish can live in a small container for a short period, but it will eventually need a larger habitat for long-term health and well-being. It is recommended to provide a betta fish with at least a 5-gallon tank for optimal living conditions.
No. all fish need fins to swim. Or they would just stay at the bottom of the tank and die.
Likely yes. Most sucker fish need a filter and heater though, and most betta's are housed without these things.
Yes. There are marine Betas as well as freshwater ones. The freshwater Bettas are Siamese fighting fish (Betta splendens). The marine or saltwater is Marine Betta (Calloplesiops altivelis)and are from the Indian ocean.
In nature or in your home? In nature they live in rice paddies in china. In your home they need at least a 1.5 gallon tank heavily planted.
Betta fish have been found to live for up to three years in the right conditions, but few in home aquariums will live anywhere near this long. You may have heard Betta fish referred to as "Siamese Fighting Fish." This is because male Betta are extremely aggressive towards one another and will fight. They have been known to flare up upon seeing their own reflections so as to intimidate what they perceive as another Betta. Female Betta fish are not quite that aggressive towards each other, though it is recommended that there be many hiding places inside a tank if several female Betta fish are to be kept together. Keeping two male Betta fish together will almost certainly result in one dying, so if you plan on buying one or however many, you will need a big fish aquarium. I found this information on a website, but I have forgotten the website name. My apologizes. But I hope this answer gives you the info you need.