The only concern I would have is the Betta, the rest are peaceful fish who shouldn't bother the shrimp at all.
It helps to have some plants for the shrimp to hide in, they're a lot happier that way. They'll often fade out or become stressed and stop thriving (won't breed, etc) if they don't have somewhere to hide out.
A small ball of java moss, or a little bunch of hornwort, or even anacharis will work, and don't require special care. As long as you have a light above your aquarium, those plants will generally thrive. If you've got 2 WPG or more, they'll grow like crazy.