Like sho220 said i have no smell unless they went to the bathroom. Even then it takes a lot of them to really stink up the room. i use newspaper as a substrate an will go threw tubs a few times a day an clean out any that have gone to the bathroom or spilt there water. This pratice keeps everyone clean an the room smelling like there are no snakes. Feeding day it will stink for a few hours till it airs out but thats about it.