My other freak incident... So, a few days ago, I awake to my wife screaming in my son's room (also the tank room). I jump up and she says "there's a snake on the floor!". I know immediately that it's an eel. I go in to see my snow flake laying on the floor, not moving at all. I'm devastated and reach down to pick it up - and when I touch it... it moved slightly. ...a light of hope... so I put it in the tank. Its sinks at first, and then starts to move a little and then finally swims back to it's normal hiding spot. Fingers crossed. Well, it came back out last PM after hiding for 4 days - and it ate a couple shrimp! I think it's going to be fine.
To answer your question.. yes, I had the top covered well at one time, but one of the glass access panels broke when I was cleaning about a year ago and I never replaced it. Of course, there's glass there now. I won't make that mistake again!