Inactivity is one sign. Also, If it has diseases, such as tail-rot, Icthyophthirius, (both which are very difficult to cure) and other aquatic parasites, it is very likely to die. And also, fish cannot live infinitely. Most bettas will live to be 3-4 years, however mine died at age 8 because of old-age.
they are spawners. they dont get "pregnant"
Hundreds is typical although some will die young.
Yes
Betta fish get in fights with fish with colorful fins and bodies. If your betta gets in a fight while your away,the weaker fish may die. But if you see your betta fight with another fish you should try to split the two fish apart [or all the fish that are fighting].
it will be sick but if it continues then your betta will die.
Bettas can die at any time.
I think so
no, one of the fish will get attacked and die
The signs of a healthy Betta fish are bright colors, no torn fins, good appetite, very active and it occasionally sleeping. Signs of a un-healthy Betta are torn fins, loss of appetite, losing color,less active very sleepy, and sometimes white eyes. Things that cause this are disease from new fish or dirty tanks, crowded tanks, or other fish.
Betta dish actually don't sleep, or they'd die.
it's fins will look raggidy and look torn.
Betta fish do not eat fish.