Bettas won't spawn at all if there is not a bubble nest.
Yes,but those betas can not have baby's together!
From my experiance, no, I've even had adult painted turtles kill baby snapping turtles, I reccomend you keep them separate
yes
baby bettas are called fry
Bettas will eat baby guppys as will most other fish, but in general, male Bettas will only fight with other male Bettas. They do not fight with other species of fish
Yes. Female bettas of all ages can live safely with other female bettas. Female bettas, unlike males, are not violent. Actually, they are quite docile and calm.
yes
Yes, otherwise the parent or other adult fish may eat the newborn fry.
Microworms, vinegar eels, baby brime shrimp, and egg yolk.
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.
Baby bettas should be fed live or frozen brine shrimp and daphnia. Older bettas will eat bloodworms,daphnia,brine shrimp,betta pellets, and blackworms.