I have to 2 year old Herman's and have had then for 8 months. One of them has put on 20 grams since if had them and the other one only 1 gram. They both eat the same. Any one know why this may be?
If you have them together it might be a case of 'mental' bullying. It is nature for a more dominant animal of any species to be top dog. The less dominant animal, because he can't get out of the other guy's territory, just doesn't do well. I'll bet if you set them up separately the smaller one will take off in growth.