They actually do have tie-downs on their tanks - they just don't need them.
The two times he got out
I would focus more in getting your boy to eat rather than breed at the moment. If he hasn't eaten for you yet, I'd be concerned about finding out exactly why he isnt eating. Based off of how you described his behavior when putting with your female, I wonder if it isn't stressing him more, which certainly wont increase his appetite any