Succulent Plant ID needed

I got this from Ikea a couple of years ago and now it's dying (it's just drying out although I tried putting it into as much sunlight as possible and not watering it too much) so I wanted to do some research on how I could keep it alive, but I have changed its original pot with the name on it so I don't know it. Can someone please help (It's the third from left)

 

Looks very like my aloe vera valadhi ?

 

It's not aloe vera. I remember it was named differently.

 

Echeveria (von perle) , Portulacaria (coral jade plant) , Haworthia pentagona , grassula arborescent (not sure need a better picture)

 

ps.just to help you with them , repot them in mixure of sand , compost and grit ....them most important if you keep them indoor , they are not dormant so they need water , but just when they are bone dry ........most important of all , when you water do not poor water on the plants , but just on the base. I keep my echeveria and haworthia in my greenhouse (they are more cold resistant) no water from October up to March .

 

My guess would be Haworthia.

 

I looked this morning and thought Haworthia but wasn't 100% sure so didn't comment. I can't see any 'hairs' or anything but perhaps there are hairless ones.

 

Hi, guys, I tend to Haworthia, too. I used to have several here, think I only have one now, and one in Florida.

Anyway, here is a super link to look at and perhaps you can find yours, valadhi. Good luck!

Haworthia: Galerie 1/19

 

Guys it`s a haworthia pentagona.....100% sure ....it the 4th that not sure ...it look like the dollar plant.
Haworthia Pentagona (via IKEA) | Flickr - Photo Sharing!

 

Ok, thank you all for your help. I have replanted it and will try to stop watering it so much (I might have done it excessively).
What about lighting conditions and temperature? Should I keep it in bright light or should it stay in a shaded environment?

 

They are succulent plants , they grow in desertic areas , full sun for them and feed in spring and summer let them get dormant from autumn up to March.