I used to think they were one of the coolest fishes until I grew up and saw what was out there in the world of fishes. I still kind of like them in a certain way.
they are cool fish, most need strict feeder guppy diet, but I trained mine to eat silversides... it was really fun to watch him stalk the guppies. Quite a delicate fish. if you have a tank for small predatory fish, these will do well.