Originally Posted by vaygirl
Pretty much what people have said already. Male bettas kept together will kill each other. They can't be kept together. You can get one male betta OR a school of guppies but I wouldn't have both in the same tank.
If the tank is large enough and theirs plenty of hiding spaces and cover, it really shouldnt be a problem.
I have seen a few people on the forums that have said they keep guppies with bettas, and the male bettas have not touched them.
From what I have read so far, it appears that EACH betta has an individual personality, some males may be more placid/Aggressive than others.