I had a six-line jump while the glass tops were off briefly. I found him dried up about 10 feet from the tank. I think the cat had somethoing to do with his final location. lol.
This sounds bad, but I wasn't really upset. Although I really liked him, he was a mean little bugger.
Anyway, I did have glass tops for awhile but didn't really like them. You definately have to keep up with cleaning them. Right now I only have a yellow clown goby so I'm running topless, but I plan to get eggcrate before I put anything else into the tank to be on the safe side.