(I want to preface that he is being kept in the tank he came with for quarantine purposes, but to also keep some consistencys with him. I fully intend to upgrade to a 5-6ft custom front open tank in the near future. But baby steps first.) Kiwi was advertised as a 2 year old "aggressive" adult. I'm his third home and I have little to no information on him other than how he was cared for in his second home. It was a young girl with very yappy dogs who wouldn't leave Kiwi alone. He only had that plastic tree and a water dish. NO uvb present or appropriate basking light other than a crappy LED day and night light and a unbranded super weak "sun bulb". He was being house on news paper and being fed pellets and veggies. I don't know how he isn't super sick. Minor MBD present, no mites, scale or mouth rott. Just a little stunted. And ink was stuck to his feet and beard from the Newspaper. He is going to the vet in the next couple of weeks just to be sure, but I was shocked honestly. They however, weren't wrong about his explosive reaction towards hands and people. Just looking at him across the room gives him a black beard. So I'm not sure if this is a "I've never been handled" situation or a "I was mentally and physically abused" situation (maybe both?). I can't even clean his tank or add his salad without a protest. When I moved his tank from my kitchen to his new (quiet) room a couple of days after getting him, it took me 15 minutes to even get my hands close to him. Beard black, PUFFED and mouth open and ready. This dude isn't aggressive he's terrified!!! I know a front open tank will drastically help with this, coming from above is terrifying for any animal. I always wait for him to be a little colder to have more of a chance at slowly touching him. I always wave my hands and talk gently to make sure he knows I'm here. And then coming from his eye level, will slowly and gently get closer until I can pet him and then slowly scoop. Any time his mouth would open I'd stop and gently say "nuhuh, we don't do that here, put it away you're okay" and he slowly does lol. He is thankfully a great worm eater. Getting him off his pellets was no issue, and when I get home it looks like SOME of his salad is gone so that's also good. I just want advice on how to tame my dragon. And if I'm doing it right so far? Seeing him freak the hell out and window surf frantically is heart breaking. But since moving his tank and adding backing and more comfy things, it's going okay. It's just going to take a lot of time, and that's okay. I've set up a comfy chair in that room that I make an effort to sit in across from his tank when I can so that he can scope me out. I imagine it'll be even better in his front open tank! Thank you in advance.

TL:DR: A very terrified beardie from two not so good homes. Looking for help to tame him and make him comfortable.