I got him months ago at 3 inches. I would say he is between 8-10 inches. The width of my tank is 24 inches and he is close to half so he could be a foot. Surprisingly, he is starting to flare at my hand when I clean the tank. He pretty much has no fear of my hand at all-at times I can even touch him. However, he is starting to flare at me and I am a bit nervous about getting bit!