I have a 120gallon tank that I have 2 young oscars and a pleco in. I want to get at least one more oscar, preferabley 2. I would like to have 4. But I don't want them to be cramped at all. According to the 1" of oscar x 3 = gallons that would be cramming them. But I was just wondering if I could make an exeption and keep my fish happy. And if I can't get 2, could i get another 1? for a total of 3.