Yep, jumpers! I had a school of 6, that slowly became the 4 musketeers, than the three amigos, now hans solo! I don't know why he didn't jump out (knock on wood), but I do have a heavily stocked tank with fish and they seem to be skittish. Great fish, wonderful color, just jumpers. The cat would drag there dry little bodies out a day or two later. Just put a lid on the tank.