I rescued a 7yr old female almost a yr ago......she was 4.5 ft at that time and weighed 454g. No muscle tone. I wasn't sure how it was gonna go, but she ate as soon as I got her home and in a nice tub. She now weighs 1500+g, and has nice muscle tone, also. Start slow.....go with smaller than normal prey items so you don't stress out his system. I fed her every 5 days for the first month or so, then cut back to every 7 days. She's a great snake....never struck or hissed, and she eats in blue, too Good luck......My guess is once you see him in 6 months, you won't want to let him go