Use off() directly in on() callback Firebase?

Let's say I have a one and done operation. Like deletes.

var q = ref.child('users').child(targetUserId).child('chat');
q.on('child_added', function(obj) {
  obj.ref().remove();

  //This works right?
  q.off();
}); 

Can I execute off() directly in the on() callback? I don't need to specify eventType correct?

Nothing else to clean up right?

From the docs:

Similarly, if no eventType or callback is specified, all callbacks for the reference will be removed.