What’s going on with this?

I got this pretty bowl of succulents from ikea a few months ago and one of the plants is losing its leaves and dieing.

Any idea what is causing it? I water it now and again doesn't seem too wet or too dry.

Does it need more sunlight?

also do you know what the tall type of succulent is and how can I cultivate it? (I really like it and want more )

 

I think its root rot, as usual bought in a very water retentive compost, the growers get away with it because they grow in ideal conditions, and want fast soft growth.
We want hard growth, the kind that would grow in nature, and is more hardy.

Bit late now, but repot in spring with lots of grit would be my advice.

I dont have a clue as to what the taller plant is
But the one that has rotted off look vaguely like the old money plant, so you should be able to root those leaves if you want to.

 

Thanks @pete - I did wonder about root rot - sounds like that is the case.

When rooting the old money plants can you just sit them in water or some perlite or are they best just sat in some soil?

 

Well as to rooting the leaves, I'd put them on a window sill, maybe on a bed of sand or perlite, just lay them on the surface and lightly spray a couple of times a day until roots or growth shows.
Humidity is enough.

A poor picture, as my flash is not working, but this is an Echeveria leaf that has been just laying on damp pebbles on a shelf over a radiator, you can just see the signs of new growth, in a few days I'll pot it up.

 

@Snorky, I think the taller one may be Crassula ovata 'Hobbit' and can be propagated the same way.

 

Oh that's good to know. Thank you both v much. I'll put some on perlite or grit and bring it inside and spray then.