How to increase humidity for reptiles?

If you're using a wire cage cover that might be part of the reason why the humidity is so low because air circulates through the wiring. I would recommend getting a couple sheets of plastic or glass and putting it on the wire lid but only half way as we don't want to suffocate the poor things. If this doesn't work completely I would recommend shortening the amount of time you have the light on. It quickly dries up the tank from the heat. You can sit the tanks by the window to allow some sun light at this time unless they're too heavy. You can turn on the room light if that's the case just keep the reptiles lights off for a longer period of time. I hope this helps!`