Sharp tank.
You've got 2 pretty delicate fish in there. I always wanted an Achilles for my 125 but have never wanted to take the risk. I wouldn't add too much else. Ya don't want that Tang to get stressed.
Good luck with them.
no i think thats about it im done for now...the only thing left that I will add is some rock and some coral and thats about it, im pretty happy with the live stock I have until I get my 300 gallon in wall setup then ill get a black tang or something