Which Tang can i keep together in my 130 gal?

[fragNplug]

I have a regal blue tang, yellow tang, and a large naso tang in my 180.
Mostly the rule of thumb is to make sure they are not the same color or shape.
If you add them all at once u wont find them fighting over territory.
However a friend of mine has 3 yellow tangs in one of his tanks, so all rules dont always apply.