Yes, the do! People usually buy them as adults but I was surprised when I saw some small, baby Betta's at the petstore.
Betta fish grow to be an average of 2 inches from head to the beginning of the tail.
No.
you don't
Yes a betta fish will grow back lost scales with time and clean water.
No
Betta fish grow paler and less active when they are sick or old.
a long time
The average is 1.5 inches
it depends on how small the bowl is betta fish usually dont grow larger then 3 or 4 inches
A Betta Fish or Siamese Fighting Fish are only a few inches. The females grow to about 2.5" and males grow to 3".
The Betta fish want to kill eachother. That's what all Betta fish want to do, that's a natural thing.
Not necessarily. A Betta is a "Labyrinth fish" but all Labyrinth fish are not Bettas. All the Gouramis are Labyrinth fish too.