You would surely be aware if Bettas have been spawing in your tank. If they have, and nothing else has been spawning in there, then in all probablility the tiny fish you can see will be Betta.
yes
Go to petsmart and ask a person there to show you witch is best for your baby betta fish.
Adult betta fish, specifically the males, will grow in the majority of their fins as juveniles. When you see bettas in the stores for sale, they are typically around 2 years old already since it takes time for their full finnage to appear.
Hundreds is typical although some will die young.
baby bettas are called fry
None are recommended if the Betta is a male.
It is pretty hard to tell. Wait until they get older then see which ones have longer fins, and shorter fins.
It's all in the tail. the males is larger and longer and the females is shorter.
their colors dull. for example, instead of bright purples and blues, they would be a dull lavender or baby blue.
A pinch of fish food once a day
the size of it's fins and body
ya