There are two requirements for the openings through which you operate your terrarium: they need to give you unrestricted access to all areas of the terrarium and they need to be easy to close so that your pets do not escape while you are working there. Most front panels can be moved sideways or have small access openings.
If other people are left unattended in the room with the terrarium, it is highly advisable you lock the terrarium. Some terrarium locks are easy to install, such as the JBL TerraSafe , which provides good security. Especially when children are present we highly recommend attaching a lock, to prevent them from playing with the animals. The enjoyment is rarely mutual and - while we understand the children's point of view fully - it should be averted.