fish and the leap of faith

[e46er]

I have had a few fish do the leap of faith out of my QT and DT tanks and frankly it sucks!

I have glass cut for the 120 DT tank but its a pain in the a** to clean daily
I grabbed some eggcrate from work but i can visually see how much light it blocks unless your directly under the MH bulbs........ now I redid my stand my old stand had a canopy 8" high off of the black trim and no fish ever got out. now my new stand I redid with slate stacking rock and with my light in the canopy only have room to go 1 piece high so 6" and i want it to cover the top black trim so its only gonna be 4 highes higher than the tank..........
this should still be high enough to stop fish from getting over I would think does anyone have experence with how high fish have jump out of the water to kill themselves?