I guess i'm confused...but who cares if someone wants to feed a koi to their piranha? People are real quick to get on a high horse about live feeding or about videos on you tube on rbp's eating a mouse or a frog, but really if you keep aquarium fish you are contributing to an industry that results in the death of thousands if not millions of fish a year. If your arguement is that it is a waste of money to feed piranhas a koi, thats stupid because its not your money and not your problem. To suggest that koi have more of a right to live than feeders is also absurd to me cus i believe that life is life whether its a plant, a mouse, a koi, or a piranha. The guy didnt really endanger his piranha by feeding them a koi and this is a piranha forum so why would people slam this guy? I have 8 baby rbp's in a 125, and although i could feed them guppies or comets or a koi if i so chose, i choose to keep them on mysis, tubifex worms, and newlife spectrum pellets purely because i think its a better diet. Personally i think if people wanna feed their piranhas live food that is 100% their choice, and if they post a video of it good for them...and remember if you dont like something you see on you tube you dont have to watch it!!!
My only problem with videos like that is that they perpetuate the stereo type of piranhas as mindless killers and entice people into keeping them for the wrong reasons