Hi... I have been thinking about this for almost two weeks.. What should I get for a piranha tank? Right now I have 3 6-8 inch red's in a 75. I got some extra spending money. Should I get a 125 and put a total of 5 red's in it or a 180 and go with 7?? I know I could go acouple more in each tank but I think 1 fish per 25 gallon is best, they just have a little extra room then... The 180 setup would cost about $450 more. Is this worth it or should I just get the 125. Also the footprint on both tanks are 72x18x23 and the other is 72x24x25.... is the extra 6 inch width that important?? Because I know the extra 2 inches tall is no big deal... Thanks for the comments and help!