At the end of the day, regardless of what you feed your tank, if its food and accessible , it will get eaten.
If its not the usual diet, when hunger sets in, it..... WILL get eaten :)
Looking at it from a hitch hiker point of view, you would be surprised at what can lurk. Even rockwork in QT will not show anything at times, then later you find you have an assassin. Welcome to the marine condition..lol