With dragons of that size, hydration is key. I typically recommend bathing them (short baths in warm water up to around their shoulders) daily to every other day and misting them on days that you don't bathe them.
Also, as small as they are you might have trouble keeping them eating well in a cage that large. If you find that they aren't eating regularly, try cutting the cage down to roughly the size of a 20 gallon (30" by 12" or so). It's easy to do by adding cardboard or a similar material.
Good luck with them!!