Fat sand rat male left alone
One of our two fat sand rat brothers died recently, unexpectedly. (Fat sand rats are actually a gerbil species, in case anyone's wondering. However, I apologize if this topic doesn't fit here.)
The other one still has some years left to live, so we've been thinking whether or not to get him a companion.
The trouble is, according to research, fat sand rats live in some sort of "semi-solitude". They live in colonies, but only one individual lives in one nest complex (composed of cavities and tunnels).
Our boys didn't do much together. They didn't wash each other, and only rarely wrestled or had any visible or audible contact. The went about their businesses while paying only little or no attention to each other. But they often slept side by side.
Now, we have several other gerbils ("regular", pallid and lesser egyptian), and at least our fat sand rat boys don't behave like other gerbils at all when it comes to social activity. They are loners if compared to others.
We bought them and put them in the same terrarium in the first place only because they were brothers and got along without trouble.
So... Should we get him another companion? Has anyone any experience on introducing fat sand rat males to each other? Or any experience on how sudden solitarity affects an individual that's been formerly living with a companion?