What do you gutload with? For the T5 HO linear UVB bulb, make sure it is only either a Zoo Med 5.0 (replace every 6 months) or an Arcadia 6% (replace yearly), no other brands or strengths. Definitely get a Solarmeter 6.5 if you afford it, too! Also, I see fake plants, and veileds can’t have them because of the impaction risk. He needs chameleon-safe and veiled-tested live plants only. Could a post a pic of the full cage (lights to bottom), please?
@Beman has linked great resources! Make sure to read through every module and the veiled species profile, as well as listen to as many podcasts as possible, from The Chameleon Academy, as they have the most accurate and up-to-date info!