Hello, I am interested in either a black piranha or a tank with 5 red belly piranhas. My tank is 100 gallons and I was wondering which one would you guys recommend? Which choice should I be happier in the long run with? Also please provide as much info as you can if you have experience with one of these. I have done my research though so I know a pretty good amount of info on each one, but I have never owned one of these of course. I do want to hear what you guys who have had experience with both of these or at least one would recommend. Thank You.