Hi Joey, Venom looks very good + healthy .
I hatched + raised a lot of these guys and quite a few actually hatch out at 4-4.5" . Venom may have been about 2-3 weeks when you got him and is an acceptable size for a 3-4 month old. Looks like you're taking good care of him. BTW, are you sure of the gender ? If not you can always post pics of his vent [ rear end ] with his tail arched high in the air. Think of a dog that's on high alert with tail straight up, pose him like that without lifting him up off the ground.