If your betta has been doing anything lately such as spending long periods of time at the bottom of the tank, if your betta has a sudden gain in weight or loss in wieght, Also if their fins aren't moving (except when they are sleeping), and also if they swim at the top of the tank for about 3 to 4 hours
it will be sick but if it continues then your betta will die.
Betta fish grow paler and less active when they are sick or old.
Betta fish change color by there environment and the types of food that you feed it. If your Betta fish is loosing color that means that your Betta is sick.
A sick one.
if they aren't active
you can tell if its a boy or girl by the fins the male Betta has long fins and the female Betta has small fins
if your physically having it with her.LOL she betta cover her mouth
Male betta's are more colorful then female's
Yes. Betta Fish do change their coloer every now and then. Or if you have a male, he will change his coloer if hes chaseing a female Betta Fish. Or if he sees another male Betta Fish.
If your betta is at the bottom of its tank, it is either very sick or dead.Sorry if this answer is too late.
A female betta has very small fins with a long body while the male betta have lots of nice flowing fins.
you can tell from the in larged stomach or belly