it might not eat it but it can bite it's tail or harm the fish
no
Yes
A guppy fish is a live bearing fish, but the female generally does not take care of her young, and will eat them.
Well, Adult Guppy's Can't Eat Other Adult Guppy's. If The Guppy's Breed Then They Won't Eat Any Of The Guppy Baby's. They Will All Work Together To Take Care Of The Baby's. But If They Breed And You Add Another Guppy/Fish Then It May Eat The Baby's.
They can not eat live grown angel fish.
Many Fish don't eat guppies, like the neon fish. That is the most common mix I know.
they eat trout,spotted grouper,
Irresponsible owners. Any fish that is large enough to eat them
no it will not but it would attack if it or it's babies are threatened
Yes so you need to put the baby fish (fry) in another container.
humans
They can and often do in great amounts. I keep some in most tanks just because they keep alot of algae in check.