Piranha Fry is cheaper??? I don't think so. Its hard to keep these guys alive. First you have cannibalism then some are going to die from being sick, not eating, or stressed out. I mean babies have a tough time making it. Then all the money on food you have to buy just to help them from not completely eating each other. And by the time its all said and done you will only have a small percentage compare to what you started from.