Be careful there. I had a sohal about a year ago that one day just decided my hippo wasn't allowed to leave the crevice of a certain rock. Those guys can be nasty, although they are absolutely stunning fish.
I have in a 300DD:
Sohal
Desjardini
Achilles
Yellow
All get along suprisingly but then again it is a larger tank and I feed a sheet of Nori every other day. Sometimes once a day.
About two years all together.
It is possible.
However once I put in the Achilles no way introducing another tang or copper band butterfly.