Do you cover your tanks?

One of my angels jumped out of his tank today. Luckily enough for me my wife happened to be at home and was able to get him back, no harm done..

I have had them for about 3 weeks and this is the first time, but todays incident just bummed me out :(

My question is do most of you have hoods for your angel tanks? My tank is fairly heavily planted and has some powerful lights on, I think the water would heat up a lot if I covered it.