New baby beardie won't eat

New to having a beardie. Got from a pet store a couple weeks ago. Thought we did a lot of research but he doesn't eat much of anything and now he seems to be turning dark (which I know is bad) please help. I've included pictures of set up and little Odin

Hi there, little Odi is barely more than a hatchling and in a precarious situation. Did he start out more active or has he been lethargic from the start? Although your set up is beautiful, the tank is waaaay too big for a sick little dragon. Set him up in a baby enclosure like this, note how I have the uvb across the top and placement of the heat bulb.
https://www.beardeddragon.org/media/29889/full

Just put one basking object in with him and feed him right on the floor where the food is easy to see. He needs a simple set up to find his food + have easy access to the basking spot. Offer water dripped on his snout for a drink. If you feed him crickets, use ONLY ones that are smaller than the space between his eyes. Put 3-4 in a jar with a pinch of calcium powder and shake it so the crix get weak + dizzy. Then drop them right near him. If he eats those, offer more.You can also get some Calci worms to drop near him as well.

Hi. I just wanted to say get rid of the red lamp. Its junk. And he needs a better uvb light. A t5 reptisun 10.0. Also if those stick on thermometers are what you are using those are not accurate. You want a digital with a wire probe or a temp gun. Good luck with your little guy

I meant to mention the red lamp isn't usually there. The humidity got high yesterday and I put that tree to raise the temp in the cage in the hopes of lowering the humidity I put it there after this was happening though.

Have you switched him to a small temporary tank like I showed you ? That needs to be done ASAP. he is weak and totally lost in the big tank. That is the # thing you need to do, he can go back to the other tank once he's grown + healthy. He is so tiny that he may not make it anyway [ sad that they sell such hatchlings at the stores and even some breeders sell them that small ] I have over 20 years experience + have raised loads of babies from the egg, so I'm just telling you what to do to give him a chance.