Yes, almost all shops sell guppies and nearly all of them sell white cloud minnows.
Yes, i have them in the same tank and they're fine
no, sharks do not eat minnows. dolphins do, though.
frogs can eat minnows
Yes, raccoons will eat minnows as well as larger fish.
Adult guppies eat their own babies, and fish like tuna eat guppies.
It depends. Some will and some won't. Crappies are know to eat minnows.
Flounders eat minnows.
most fish will even guppies will eat other guppies it is a risk all ways
Guppies are livebearers. So they don't lay eggs. Male guppies WILL eat their own baby guppies. They will eat any baby guppy they see. It doesn't matter if it's their own or some other guppies'. Male and female guppies eat baby guppies.
no
Like all animals, minnows get their energy from the food they eat.