Adding Tangs

[Psyire]

I would add the Regal and Kole Tang first, then once they've settled in add the Yellow and Blonde Naso. I doubt you'll see much for trouble as the 4 tangs you've selected aren't closely related to one another. If you do just tape a big mirror to the side of the tank for a week or so, they'll fight with themselves and eventually give up and should get along. (worked for my dwarf angelfish really well)

[The Guy]

I have a yellow tang in my DT and plan on adding a Kole after he spends some time in the quarantine tank just to be sure he's all good, bought him yesterday at J&L's boxing day sale, he's very cool. Their fish are usually good to go.