I think the deep green sedum is Sedum rubrotinctum that has grown in a very shaded area so it is in a deep green color.
The one pointed out by Kate looks like Sedum sieboldii.
The taller growing succulent could be an echeveria.
For me, I prefer to group similar types of plants so I would remove the purple tropical plant, because it would need more water than the succulents. I would just gently tug it out from the group. You can just use regular potting soil for the tropical plant and use a container with drainage holes as well.
Just use a slightly wider but shallower container with drainage holes and use cacti/succulent mix for the succulents. Usually I even add extra perlite or pumice on the mix to really keep it well draining and open. Those sedums do not have a big root ball since they are still very young, and eventually they just grow them very shallow. They can take brighter light and warmer temps. If your temps are stable now like above 55F and higher, you can slowly introduce them outside, just be mindful if it rains too much, keep them in a protected but bright area.
