we have a lone glider. we are going to put him with a colony. But we got him as a lone glider and have had him about 6 months. he has been to the vet. he is healthy, alert, active, and getting slowly bonded to us. He is a bit skittish at times, but he doesn't bite and I can scoop him up without him biting me.
our colonies seem very happy to be together with other gliders, but connor seems just fine by himself. no over grooming or weight issues.