Good idea.
I also have a green mandarin in a RSM which when i aquired it was skinny as a twig with a sunken in stomach.Shes now big fat and looking better than ever.
Some people say that a RSM is to small to house a mandarin,but in my PERSONAL experince and not just some crap ive read of the net,An RSM is a fine candidate for a mandarin aslong as you have a healthy pod population and a mature tank.
Pod population is bigger than ever and so is my mandarin,proof is in the pudding,no 2 ways about it.
I will try and get some photos of her tonight 8)