Can I put 2 male guppies together

Generally, you should keep guppies in groups. And ideally, you should keep at least a trio of guppies in at least a 5-gallon fish tank. You can keep more than a trio of guppies but then you will also need to increase the tank size of your fish tank according to the number of fish you are going to keep in the tank. Oct 16, 2021 (source)
There Are Males In The Tank However, when males are in the tank, they often harass the female guppies, which results in them being unable to spend as much time with each fish as they need to. When this happens, they don’t bond as well, and they often end up becoming aggressive towards each other and fighting. (source)
https://www.youtube.com/watch?v=UJNic5gddy0
Yes, they generally are. Guppy males are territorial and will fight for the females around the clock. Even if no females are available, males have an innate higher level of aggression that they love displaying every chance they get. Nov 10, 2021 (source)
One of the most common signs of aggression is when one guppy is constantly chasing another. This is because they’re trying to assert their dominance by scaring them and attacking them. While it occurs more in males, it doesn’t mean females won’t do it either (you’ll find out more about this later). (source)
https://www.youtube.com/watch?v=yK-jv2g3bqM
So to conclude this article: yes, guppies and betta fish can live in the same aquarium. You will have a bit more work feeding your betta separately and you will also need to purchase live plants, but it is doable. Oct 26, 2021 (source)
Male guppies are always smaller than female ones. This means that you can accommodate 10 of them in a 10-gallon tank without an issue. But, a female guppy is 2 inches in size. If you plan to keep only females, you will need to limit their number to 5 per 10 gallons of water. Oct 17, 2020 (source)
Anyway, to cut a long story short, yes, male guppies fight, and yes, if their fins are repeatedly damaged then problems like finrot can occur. They may calm down once a pecking order is established, but don’t bank on it. (source)
The most common reason for guppies dying in your aquarium is the poor water quality. By feeding your fish you actually pollute the water in your tank. Guppies produce waste (they poop and pee), which is polluting the water. Over time the pollution can become so high, that the guppies will get intoxicated and will die. (source)
To dispel misinformation and myths once and for all, guppies cannot change sex and are not hermaphrodites. Females need males to fertilize their eggs and produce offspring, but they will also store the males’ sperm several months for when males are not available. Jan 20, 2022 (source)