Thanks guys. If I had to ball park it I would say he would be in the 9 inch range, give or take a little bit. I am kicking myself for forgetting to measure when I was acclimating. He is doing well for his first full day in the tank, he kinda checks people out when they enter the room, but no finger chasing yet.
I dont really know anything about his past, but I am guessing he is 3+ years old. I am going to try to get some shrimp in him tonight to try and fatten him up.