the size of it's fins and body
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.
A betta normally only lives 2-3 years, so it would be around 70 years old in "betta years".
It's all in the tail. the males is larger and longer and the females is shorter.
Betta fish grow paler and less active when they are sick or old.
ya
A nine month old betta is already full grown, so yes.
No betta fish are carnivores.
other Betta fish and the bigger fish.
Betta fish do not eat fish.
their colors dull. for example, instead of bright purples and blues, they would be a dull lavender or baby blue.
Signs of old age in betta fish may include decreased activity levels, slower movement, faded coloration, fin deterioration, and reduced appetite. It is important to monitor your betta fish closely for any changes in behavior or appearance as they age.
Well, if you love your Betta fish, then it should live by itself. But if you add another Betta to your current Betta fish's tank, then they will start a fight because Betta Fish are Siamese fighting fish and if one Betta is in contact of another Betta, the possible reason would be a fight between them two.