I have a few in one of my tanks, but they're all still small. The hatchery where I used to work raises some every summer and a friend that works there gave me around a dozen little ones to use as feeders. I split them between my 2 turtle tanks and my two aquariums. My oscar, sev, and bahia red had them gone instantly, and it took my turtles a week or two to catch all of them, but in my other tank my little Uaru of all the fish in there was the only one to eat one.Anybody keep these things as pets? or are the just aquacultured for food?