I have a 120 gallon FOWLR tank and it's 6 feet long. I have live rock with quite a few caves! I love purple tangs so much, but I love powder blues as well. They would be the only big fish in the tank as I only have 4 clownfish and a yellow watchman with plans to get a midas blenny and some kind of dwarf angelfish. I was curious what people thought about getting both???