no more tetras. now, it's with (3) 2.5" tinfoil barbs and (1) 2" flagtail. the jar was chasing them around the other night, but didnt' strike any and they were all fine when i got up the next morning. looked like it was just playing with them. it's the only time i've seen it even pay attention to them. it didn't chase the flagtail at all, just the barbs, which is good.