Hi I'm new here. But I would like to share on this topic.
I have 5 tangs in my current tank. It's a 180 standard. I've had the tank up and running for 2 years and have most of these guys in the tank for those 2 years. But lately they have been getting a little to big for the tank and started fighting a little.
Here's my list in order I added to the tank
Regal blue tang
Pick to prove
They all pretty much about the same size, about 5"s or so. Really only the sohal and clown chase the purple. Surprisingly the sohal and clown tang get along nicely. I've thought about letting a few of them go but the wife refuses to let me do that. She even bought me a bigger tank so I had to keep the five tangs. I'm currently waiting on the stand to get the 300 up and running.