No, probably not. They're just as small/ smaller than guppies... however...
The Neons are a shoal fish and like to be kept in groups of around 6 or more. If they're in smaller groups they will be nervous and would probably nip on the guppies fins. If the fin nipping becomes serious enough the guppy could die.
Guppies will eat neons tetra babies but are not large enough to eat fully grown neons.
any time it don't matter
Many Fish don't eat guppies, like the neon fish. That is the most common mix I know.
Neon Tetra is one of the natural food for the angelfish in the wild. Although, most fish will eat anything that can fit into their mouth.
angel fish can eat neon tetras is the simple answer, but i have angel fish and neon tetras in the same tank and the angel fish does not bother the neons, although this may be because the angel fish is not full grown yet so it is a 50% chance
yes. a neon tetra can live alone but all fish get lonley so on the safe side you might want to buy another fish. and make sure that the sex is diffrent or the male will try to eat the other male.
If the neon is in a tank with other neons then there is a good chance it will grow back. If your neon is in with other fish and larger fish there is a very good chance it will be eaten "Big Fish Eat Little Fish".
Assuming that you are referring to neon tetras, there are several brands of commercial "Tetra Flakes" that can be bought at nearly every pet store. I believe that there is also a pellet version of "Tetra Flakes".
This is a tough one. Your tetra's life is in jeopardy here. It might and might not.
Adult guppies eat their own babies, and fish like tuna eat guppies.
The tiger fish would eat the guppies.
Flakes