Does anyone have a crested gecko? And should I move one into my already made chameleon enclosure due to me getting my chameleon a much bigger one?

[Bigbrothet1$$]

So I have a 18x18x24in enclosure with another cage on top to make it taller. I plan on buying a new enclosure for my chameleon and want to get a crested gecko into the glass tank. My question is: should I strip the tank clean, or should I leave it how it is (it’s bio active btw) and just out the crested gecko into the tank?

-I know this is a chameleon forum but I thought it would be worth a shot and I leave no rock unturned because si want the best for all of my baby’s.