Thanks for your guys' input!
Tracie, unfortunately I don't know how much of his tail is nipped off as he had already had it missing when I got him. Based on where it cuts off though, I can assume by now, it would have given him an extra 2 or 3 inches.
This picture was taken in April, about 6 months ago.
This picture was taken about 2 weeks ago.
If any of you have checked out my most recent post on September 29th, you would know that he has not shown any growth in length since about the end of February. He has however, gained about 100 grams since then. Which boggles me because I'm not sure why he's not growing in length, but retaining weight.