Currently, I have my Peacocks/Haps in a 120G (4x2x2). I want to move my Mbunas to the 120 and get a larger tank for the Peacocks/Haps. I really want a 180 6x2x2 but they dont seem to show up for sale very often. I see lots of 125s for sale. Here is my question. While the 125 is 2 feet longer, it doesnt really gain me any water volume. Should I hold out for a 180 or jump on a 125 and not worry about the extra depth and height?