Guppies should be fine, its really a fish by fish scenario but in the larger scale guppies aren't a high risk fish. The main thing to consider is having plenty of hiding places, so live plants would be a great addition if that's something that you are considering.
The shrimplets will however be in danger with any fish that can fit them in their mouth (they are like the size of the lead tip of a pencil... not mechanical) but then again that is where the hiding places come into play.