Thoughts on new fish additions

[willthethrill]

Hello, I have a 120g tank (w/ 55g sump and 40g refugium) that has been setup a little over 4 months and fully cycled. Have 2 clowns and a chromis in there that were put in to continue helping along the biological filtration.

I'm ready to throw in some new fish into A 20g QT tank I have ready to go. From the fish I've researched and decided I ultimately want to see swimming around in my display as sort of the "show pieces" are the copperband butterfly, yellow tang, powder blue tang, and blue hippo tang. I understand tangs are aggressive towards each other.

Should I get the copperband first and then in a few weeks get all 3 tangs at the same time so they are introduced together?(limiting aggression/territorial disputes)

What are your guys thoughts?
(There are other fish on my list too but these mentioned were my main concern)

 

[Mr tap water]

That's probably the best thing to do put the butterfly in first then the other three. From my experience I found yellows take no notice of Blue hippos and vice a versa when introducing them but the powder blue Will become the dominant Fish in your tank and could even go in last of all.