Hi, I am planning on getting a 180 Gallon (96x18x24) in about a month, and I will be moving my fish out of my 135 (72x18.5x23.5) into the new tank. I will have an empty 135 gallon that I would like to try something new with. I have a Red-Eyed Red-Tailed Dwarf Puffer in a 45 Gallon, and I wanted to do my first tank to have only large fish. I was wondering if I could keep 1 Oscar, and 1 Fahaka puffer in a 135. Please give other ideas, thanks for the help.