Okay, i've had my tegu, Reptar, for about a month or so, when i first got him, he was the sweetest little guy, little shy, but sweet. I spend at lease an hour or 2 with him every day, but for the past few days, every time i even go into his cage, to even water him or anything, he hikes himself up and starts hissing, he's even lunged at my hand a few times. I don't know what his problem is lately, it's really upsetting me. Im to the point I'm starting to get scared to even pick him up, thinking he is going to latch onto me. What should i do?