Hey there, please don't get angry about the title. I am going to set up a 120 gallon mixed reef tank at the end of this year or the beginning of next year. So, I will have a purple tang and a tomini tang. But to reduce the aggression by a little. What will be the best third tang? The two best options I have till now are a blue/regal tang and a sailfin tang. These are the two best options I have. For the title I asked if I can keep a blue/regal tang in a 120 gallon tank since for the aquascape, I want it to be like an island and it will not be touching the glass on any sides. The aquascape will be a minimal one. So, the tang will technically have a swimming space of eight feet instead of four feet. Since it will be able to around the aquascape without stopping. I will also have a refugium and an oversized protein skimmer. If there are any other tangs instead of blue tang and sailfin tang that I can keep with the purple tang and tomini tang please let me know. Thank you. Have a great day.