I lost about $200 worth of fish a few years back when I was fairly new in the hobby to a pair of JD's the LFS said the JD's would be the ones more than likely to get eaten. I cant remember what they where but it was a expensive trip to the City for feeders for me.
i lost 3 f1 red terrors from jeff rapps 15 a peice to a jd in one night when he was fine with them for about a month. just lost a syno catfish not sure what species but was $20 to my jag who didnt bother him till now.