Interesting, my Aru type male is between 63-69 inches long, at least 4 years old now. Food has never been an issue for him!!
:::What is the average length of an adult GTP? Does it vary by type (Biak, Aru, etc..)?
::Supposedly, it does vary by type, with biaks being the largest and arus being the smalles. I have a very large adult female that's about 6' long. I think this will be about as big as they will get. Most will average betweek 4.5-5'.