I lost one clownfish this way...an absolutely beautiful female black ocellaris bred at Sustainable Aquatics. She was about 3" long, jet black (including her face) and with stripes so white they almost looked bluish. Just a perfect fish. I brought her home to pair with a juvenile B&W ocellaris. She lasted 3 days before she went carpet surfing--I went out for about 30 minutes to run an errand and came back to find her on the floor, almost completely dried out. Made me sick.
She was always jumpy and nervous, though. She always hovered near the top of the tank and never really seemed to settle in. I don't think it helped that the idiots at the LFS where I got her had housed her with a bunch of blue devils for months on end (she was hiding at the top corner of the tank when I saw her, but seemed in perfect health otherwise).

I bought another captive-bred black ocellaris (another orange-faced misbar like the one I already have), and these two so far seem calm and happy. After reading some of these stories, though, I'm considering getting at least a partial cover for the top.