I just got my first Northern Diamondback Terrapin yesterday. He is about 2.5 inches. I love his skin coloring, he seems very light to me for a northern. I was debating whether to get a concentric or not because I love their light coloring, but decided not to and to save a few bucks. He has been very active since I got him and seems to love his new tank, he has not eaten or basked yet however, but I have read that this is common since he is most likely stressed in a new environment.