Bettas often sleep lying on one side, at the surface or resting on something. If it swims normally when awake then don't worry about it, but if the betta also seems to have trouble swimming (stuck at the surface even when it tries to dive, or unable to rise far off the bottom) then something is wrong. Usually it means you're feeding it too much and need to cut off food until it can move normally again. Their stomachs are quite tiny. It's also possible the betta is sick, and you should read websites like bettatalk to find out what you can do for them.
This is not a Betta question so it belongs elsewhere.
Stagnant ponds and rice patties in the Vietnam area. They breathe air because the water doesn't have any oxygen in it.
Betta eggs develop in the cluster of floating bubbles the male makes at the surface of the water. Before that, they're in the female...
In their natural habitat they live in puddles in Asia.But in a fish tank I would put some smooth gravel with one or two fake plants.
fishs eddy
it looks like they have a big bubble in their side
NO
usually a male has longer tail fins but they are about the same for side fins
keeping multiple bettas in the same tank is not reccomended
deers or fishs
Betta dish actually don't sleep, or they'd die.
diseased.