I would like to keep some piranha, not because of their 'fearsome' reputation or for any macho crap, but because they really are beautiful fish. I have an 100x40x50 cm aquarium, is this large enough to house some? If so, what species do you suggest? I liked the look of Serrasalmus notatus, but I have no idea of what they need. I can over the fish about 3 water changes a week, whatever decor and food they need etc. Sorry if I have said anything stupid, but I have no idea what I'm doing (I usually keep plecos and rainbows so it isn't something I'm used to). If I can't keep any the tank size stated then I can't, it is no problem to me as I understand every fish needs to live happily. Thanks