They use their tail and their swim blatter and that is an organ that fills and emties with air so they rise and fall.
Bettas are active swimmers by nature, constantly exploring their environment and looking for food. They may also swim around a lot due to boredom, stress, or feeling territorial. Providing plenty of space, enrichment, and hiding spots in their tank can help alleviate this behavior.
Bettas can swim anywhere in a tank but they tend to hang towards the top third most of the time.
Wild bettas primarily eat insect larva that floats on the surface of the water, like mosquito larva. If they swim by it and it wriggles, they eat it.
Boy bettas have really big fins and are very colorful, and girl bettas are pretty much the opposite!
Bettas originate from Southeast Asia.
Male bettas should be kept alone. Female bettas can sometimes be kept with other fish, but in a large community tank. Bettas need their space!
bettas are very territorial fish, the males fight for their territiory.
the same as all the other bettas
Bettas will eat baby guppys as will most other fish, but in general, male Bettas will only fight with other male Bettas. They do not fight with other species of fish
Bettas are slow retiring fish. They do not move around much normally. Silvery coloured "pectoral fins" are quite common.
If you meant to say oxygen, then yes some fish, like bettas, swim to the top to get air while others use their gills to get air from the water they live in, like goldfish.
In most cases, it is not recommended to keep guppies with female bettas. Female bettas can be quite territorial and may perceive the guppies as intruders. This could lead to aggression and potential harm to the guppies. It's generally best to house guppies with other peaceful, non-aggressive fish species.