Yes, they are rear-fanged.
Diet is small fish. And they will fish them out of their waterbowl. Fun to watch.
Size is about like garter snakes.
I did not find the one I had to be agressive at all, but I wore gloves just in case. From what I found out, the venom will just make you throw up and fell like crap for a couple days.

Be sure you are looking at a healthy one. Mine had a previous wound and didn't survive.

(Yeah, that's what you get for ultra cheap impulse buys.)

Murri