I wasn't so lucky a while back; clown jumped out of a shallow tank and became jerky. Needless to say, I wouldn't consider going topless again.screen cover?
A few days ago, a clownfish in my tank got spooked. He jumped up, hit the screen and bounced back into the water. Without a lid he might be dead. This was with me around, I have to assume they do this when I am not around as well.