Yes, I had two sunset platies but one jumped out of the tank. But that's not what your looking for. they both swam together like they were in a school of fish so your answer is once again yes.
no. fish can only mate with fish of the same species. Gouramis mate with gouramis and platys mate with platys.
Peaceful fish, who aren't large enough to eat the betta. Many quicker fish like to chew on their long fins. Medium-small schooling fish (tetras, platys, mollies, non-fancy guppies) and bottom dwelling fish/frogs/snails are safe.
swordtails
yes and they can more than one at a time
Mickey Mouse Platys don't lay eggs. They give birth to live fish.
No, fighting fish (Bettas) are only interested in fighting with other fighting fish.
No, They need oxygen in the water to live, and space to swim around.
guppys, not. not sure bout the others
Most livebearing fish such as mollies, platys, and guppys begin having fry (baby fish) once they hit 4 months of age.
Platys are not mid water or bottom fish they are like guppies live at the top
Most schooling fish tend to have colors of reds or blues with different patterns. Three common schools of fish are tetras, barbs and danios..
Male Platys (and Swordtails) are notoriously bad tempered fish and often fight and bully one another. That is simply part of their nature.