Yes, twice...the first time, I dripped a group of 7 Neolamprologus marunguensis, netted them and dumped them into the tank. He killed four of them in about five seconds, and ate the ones he killed in about ten more seconds. It was wild, and stupid of me not to anticipate given his crazy feeding response. He left the rest alone, though, and when I added more (currently at 11 total, no more planned) I did it at night and he never even looks at them. I have also done this with the 3 Labidochromis/Metriaclima hybrids I am removing tonight, no problem. I added a bunch of small yellow L144 BNP and he snacked on those, I think they were just too slow and small and tempting as they clung to the glass to resist. I never saw them getting eaten but they all disappeared but one, which figured out to stay behind the FX6 intake. (I have since removed the L144 and use CAE for algae, and they do fine.)