question about betta fish?

[LOTRFan1]

So my daughter has a 20 gallon aquarium. The water is cycled is the right temp and the ph is balanced just so everyone knows.
I am starting my daughter out with beginner fish. So far today we added 5 guppies, we also plan on adding 3 glo fish on tuesday. I was wondering if 1 male betta fish would get along with everyone else.. I was doing some reading on them online and it did say that they do well with other fish on their own but I just got to make sure..

 

[YourMom]

No they will fight all the fish and they would all die.

 

[KellyRenéem]

Woah. Definitely do not put the Betta in with the other fish. Betta fish tend to be quite aggressive. Not all of them are going to be like this, but the majority will. My Betta killed every type of fish we tried putting in the tank with him.