I see a few thing that jump out.
(1). Your supplementation should be calcium with D3 twice a month. multivitamin twice a month, and calcium without D3 at every other feeding.
(2). You should upgrade your enclosure to a bigger one a 4'x2'x2'.
(3). Temperature should be 90-95 degrease in the basking, and down to the low 70's at the bottom.
(4). Humidity is important with these guys you should invest in a digital hydrometer they aren't that expensive. Place it near the center of the enclosure. It should be 70-75%, after misting and drop to 40-45% while drying out which it should do completely.
(5). He has to have a UVB bulb of at least 5.0 to convert the calcium, or otherwise he could develop MBD.
Hope this is helpful, and remember to take in a stool sample when you go to the vet,