lol @ bump within 1 minute of opening the thread.
I don't think they get past 14" and I don't think they need anything bigger than a 125, and that's being conservative. A member here has a 10" Umbee pair in a 55 and then they're going to a 90 gal and they don't look miserable yet. But depending on who you ask they will tell you an Umbee pair need an olympic-size swimming pool to be happy.