Yeah those colombian Gu's have a rep for being nasty tempered and hard to tame down and those little teeth are no joke,but believe it or not i have actually seen some pretty tame ones and members on tegutalk with hand tame colombians. They just need a lot of work when it comes to taming them. Ounce you do manage to tame them down( tolerant) they are some really cool lizards and they have out of this world feeding responses lol,Hope you enjoy your Gu ,any pictures of the guy?

I have seen more aggressive lizards though.