That's funny. My tilapia swim around like kings. I spawned some in a small pond and the first 60 that I moved to the small bass pond act like there is no danger. My bass are on feed and probably not as aggressive but when the few pellets reach the edge of the moss, the tilapia peck at them. This is in pretty deep water. The tilapia are only about 4" long and sprint to the moss only when the bass get within a foot.
PFF thinks they are easy prey and I question a bass's ability to catch the fast buggers before fall. I have to dump most of the water out of the bucket to catch them with my hands!