there isn't anything that is sure fire on keeping aros from jumping. You can blackout the tops only allowing the area around the light fixture to show clear for lighting. then they will hopefully get the point but that's not sure fire.
the best I have read is to somehow "pad" the top of the tank so when/if they do jump the injuries will not be great if at all.
the best advise is to make sure something it holding the tops down.
Is this to keep the aros from jumping(which is not likely to happen) or to keep the aros in the tank when they do jump?
Best to have a pliable top that keeps them in but gives to absorb some of the impact to reduce injury. Question is can this be made and still be practical