ok so ive just finished building my small reptile rack (mostly for leopard gecoks) but i was wondering what are some other reptiles that dont require any uv light or basking lamps
Most snakes don't require UV lighting though most of the diurnal ones would need a basking light. Some of the nocturnal snakes would be okay with just an UTH with a hide over it, like ball pythons. Crested geckos/other geckos in the same family don't need a basking light or UV lighting but they need fairly large vertical caging. They like room temperatures and eat fairly simple diets too but they need a tropical humidity. If you're looking for something to add to the rack, snakes are probably the way to go. Just make sure they are secure so they don't get out and bother the geckos!
Well, how about African fat tail geckos? They're probably the best bet, for something you can put in the same rack as leopard geckos. Very similar care needs, they just need it a bit more humid and not quite as hot. They get a bit bigger, have a slightly different look, and, at least from what I've seen, are often more laid-back than Leopard geckos.
That's about all I can think of, though. Everything else has drastically different care requirements (i.e. crested geckos--too cool and arboreal to share a rack with leos), or are snakes...
Though there might be a couple, less common species of gecko that are close enough to leopard geckos to share the rack... Might find a good gecko forum and ask for suggestions there.