Oh, I've read all the stories, and I have no idea why it hasn't happened to me. I don't know if this has anything to do with it, but my sump/fuge is not under my tank, but beside it -- there is some light spillover from my fuge being lit 24 hours, but not a whole lot, in fact for a while I had an old t-shirt b/t the two to block the light.
I wish I had a reason as to why I haven't had many issues with mine eating fish.